https://reefguide.orgA Guide To The Tropical Reefsen-usMon, 13 Apr 2026 18:02:14 -0400https://reefguide.org/spirobranchuscorniculatus.htmlhttps://reefguide.org/spirobranchuscorniculatus.html
Indo-Pacific Christmas Tree Worm
Scientific Name: Spirobranchus corniculatus
Order: Sabellida
Family: Serpulidae (Tube Worms)
Category: Tube Worms
Size: 1 to 1.5 in. (2.5 to 4 cm)
Depth: 10-100 ft. (3-30 m)
Distribution: Indo-Pacific, Hawaii, Australia, French Polynesia
]]>Wed, 08 Apr 2026 14:29:41 -0400https://reefguide.org/carcharhinusmelanopterus.htmlhttps://reefguide.org/carcharhinusmelanopterus.html
Blacktip Reef Shark
Scientific Name: Carcharhinus melanopterus
Order: Carcharhiniformes (Ground Sharks)
Family: Carcharhinidae (Requiem Sharks)
Category: Requiem Sharks
Size: Up to 5 ft. (1.6 m)
Depth: 0-200 ft. (0-60 m)
Distribution: Indo-Pacific, Hawaii, French Polynesia
]]>Wed, 08 Apr 2026 09:06:01 -0400https://reefguide.org/turbinariareniformis.htmlhttps://reefguide.org/turbinariareniformis.html
Yellow Scroll Coral
Scientific Name: Turbinaria reniformis
Order: Scleractinia (Stony Corals)
Family: Dendrophylliidae
Category: Stony Corals
Distribution: Indo-Pacific, Fiji, Micronesia
]]>Tue, 07 Apr 2026 00:17:41 -0400https://reefguide.org/palythoacaesia.htmlhttps://reefguide.org/palythoacaesia.html
Sea Mat
Scientific Name: Palythoa tuberculosa
Order: Zoantharia (Zoanthids)
Family: Sphenopidae
Category: Zoanthids
Size: Polyps 0.3 in.
Distribution: Indo-Pacific, Hawaii, French Polynesia
]]>Mon, 06 Apr 2026 23:50:16 -0400https://reefguide.org/chironephthyasp1.htmlhttps://reefguide.org/chironephthyasp1.html
Chironephthya sp. 1
Scientific Name: Chironephthya sp. 1
Order: Malacalcyonacea
Family: Siphonogorgiidae
Category: Octocorals
Distribution: Fiji
]]>Mon, 06 Apr 2026 23:40:52 -0400https://reefguide.org/parapercishexophtalma.htmlhttps://reefguide.org/parapercishexophtalma.html
Speckled Sandperch
Scientific Name: Parapercis hexophtalma
Order: Perciformes
Family: Pinguipedidae (Sandperches)
Category: Sandperches
Size: Up to 9 in. (23 cm)
Depth: 15-100 ft. (5-30 m)
Distribution: Indo-Pacific, Red Sea, Great Barrier Reef, Fiji
]]>Mon, 06 Apr 2026 23:14:06 -0400https://reefguide.org/cannonballjellyfish.htmlhttps://reefguide.org/cannonballjellyfish.html
Cannonball Jelly
Scientific Name: Stomolophus meleagris
Order: Rhizostomeae
Family: Stomolophidae
Category: True Jellyfishes
Size: Up to 10 in, (25 cm)
Depth: 0-10 ft. (0-3 m)
Distribution: Caribbean, Florida, Gulf of America
]]>Mon, 06 Apr 2026 23:03:51 -0400https://reefguide.org/seathimblejellyfish.htmlhttps://reefguide.org/seathimblejellyfish.html
Sea Thimble Jelly
Scientific Name: Linuche unguiculata
Order: Coronatae
Family: Linuchidae
Category: True Jellyfishes
Size: 0.5 to 0.75 in. (1.25 to 2 cm)
Depth: 0-10 ft. (0-3 m)
Distribution: Circumtropical
]]>Mon, 06 Apr 2026 23:03:06 -0400https://reefguide.org/mastigiaspapua.htmlhttps://reefguide.org/mastigiaspapua.html
Spotted Jelly
Scientific Name: Mastigias papua
Order: Rhizostomeae
Family: Mastigiidae
Category: True Jellyfishes
Size: Up to 5 in. (13 cm)
Distribution: West Pacific
]]>Mon, 06 Apr 2026 23:02:25 -0400https://reefguide.org/netrostomasetouchianum.htmlhttps://reefguide.org/netrostomasetouchianum.html
Purple Crowned Jellyfish
Scientific Name: Netrostoma setouchianum
Order: Rhizostomeae
Family: Cepheidae
Category: True Jellyfishes
Size: Up to 8 in. (20 cm)
Depth: 15-300 ft. (5-90 m)
Distribution: Fiji, West Pacific
]]>Mon, 06 Apr 2026 23:00:00 -0400https://reefguide.org/processasp1.htmlhttps://reefguide.org/processasp1.html
Processa sp. 1
Scientific Name: Processa sp. 1
Order: Decapoda (Decapods)
Family: Processidae (Night Shrimps)
Category: Night Shrimps
Distribution: Fiji
]]>Mon, 06 Apr 2026 16:36:52 -0400https://reefguide.org/seapearls.htmlhttps://reefguide.org/seapearls.html
Sea Pearl
Scientific Name: Valonia ventricosa
Order: Cladophorales
Family: Valoniaceae
Category: Green Algae
Size: 0.75 to 2 in.
Depth: 3-250 ft. (1-75 m)
Distribution: Circumtropical
]]>Mon, 06 Apr 2026 14:54:02 -0400https://reefguide.org/chromisweberi.htmlhttps://reefguide.org/chromisweberi.html
Weber's Chromis
Scientific Name: Chromis weberi
Order: Ovalentaria
Family: Pomacentridae (Damselfishes)
Category: Chromis
Size: Up to 5 in. (13 cm)
Depth: 10-75 ft. (3-23 m)
Distribution: Indo-Pacific, Red Sea, Australia, Micronesia, French Polynesia
]]>Mon, 06 Apr 2026 12:55:43 -0400https://reefguide.org/macrophiothrixnereidina.htmlhttps://reefguide.org/macrophiothrixnereidina.html
Violet Brittle Star
Scientific Name: Macrophiothrix nereidina
Order: Amphilepidida
Family: Ophiotrichidae
Category: Brittle Stars
Size: Arms up to 6 in. (15 cm)
Distribution: Indonesia, Philippines, Malaysia, Great Barrier Reef
]]>Mon, 06 Apr 2026 10:26:25 -0400https://reefguide.org/pseudocerossp2.htmlhttps://reefguide.org/pseudocerossp2.html
Pseudoceros damawan
Scientific Name: Pseudoceros damawan
Order: Polycladida (Polyclad Flatworms)
Family: Pseudocerotidae
Category: Polyclad Flatworms
Distribution: Fiji, Micronesia, Indonesia, Philippines, New Caledonia
]]>Sun, 05 Apr 2026 21:22:03 -0400https://reefguide.org/phyllidiellarosans.htmlhttps://reefguide.org/phyllidiellarosans.html
Rose Phyllidiella
Scientific Name: Phyllidiella rosans
Order: Doridida
Family: Phyllidiidae
Category: Dorid Nudibranchs
Size: Up to 1.5 in. (3.5 cm)
Distribution: Indo-Pacific, Hawaii
]]>Sun, 05 Apr 2026 19:59:55 -0400https://reefguide.org/maritigrellaeschara.htmlhttps://reefguide.org/maritigrellaeschara.html
Maritigrella eschara
Scientific Name: Maritigrella eschara
Order: Polycladida (Polyclad Flatworms)
Family: Euryleptidae
Category: Polyclad Flatworms
Size: Up to 2 in. (5 cm)
Distribution: Indonesia, Philippines, Australia, Palau, Micronesia, Hawaii, New Caledonia, Fiji
]]>Sun, 05 Apr 2026 19:33:53 -0400https://reefguide.org/polyandrocarpapolypora.htmlhttps://reefguide.org/polyandrocarpapolypora.html
Polyandrocarpa polypora
Scientific Name: Polyandrocarpa polypora
Order: Stolidobranchia
Family: Styelidae
Category: Tunicates
Distribution: Fiji
]]>Sun, 05 Apr 2026 17:43:00 -0400https://reefguide.org/thysanozoonnigropapillosum.htmlhttps://reefguide.org/thysanozoonnigropapillosum.html
Gold-dotted Flatworm
Scientific Name: Thysanozoon nigropapillosum
Order: Polycladida (Polyclad Flatworms)
Family: Pseudocerotidae
Category: Polyclad Flatworms
Size: 0.5 to 2 in. (1.25 cm to 5 cm)
Depth: 10-100 ft. (3-30 m)
Distribution: Indo-Pacific, Fiji, Micronesia
]]>Sun, 05 Apr 2026 16:47:53 -0400https://reefguide.org/urocaridellasp1.htmlhttps://reefguide.org/urocaridellasp1.html
Urocaridella pulchella
Scientific Name: Urocaridella pulchella
Order: Decapoda (Decapods)
Family: Palaemonidae (Commensal Shrimps)
Category: Commensal Shrimps
Size: Up to 1.25 in. (3 cm)
Depth: 6-50 ft. (2-15 m)
Distribution: Indonesia, Philippines, Malaysia, Solomon Islands
]]>Sun, 05 Apr 2026 14:45:05 -0400https://reefguide.org/urocaridellasp2.htmlhttps://reefguide.org/urocaridellasp2.html
Urocaridella degravei
Scientific Name: Urocaridella degravei
Order: Decapoda (Decapods)
Family: Palaemonidae (Commensal Shrimps)
Category: Commensal Shrimps
Size: Up to 1 in. (2.5 cm)
Depth: 6-50 ft. (2-15 m)
Distribution: Indonesia, Philippines, Palau
]]>Sun, 05 Apr 2026 14:42:12 -0400https://reefguide.org/pacifichighhat.htmlhttps://reefguide.org/pacifichighhat.html
Pacific Highhat
Scientific Name: Pareques viola
Order: Eupercaria
Family: Sciaenidae (Drums)
Category: Drums
Size: 4 to 8 in. (10 to 20 cm)
Depth: 10-100 ft. (3-30 m)
Distribution: Gulf of California, Pacific Coast of Mexico to Panama
]]>Sun, 05 Apr 2026 10:39:09 -0400https://reefguide.org/razorfish.htmlhttps://reefguide.org/razorfish.html
Jointed Razorfish
Scientific Name: Aeoliscus strigatus
Order: Syngnathiformes
Family: Centriscidae
Category: Shrimpfishes
Size: Up to 6 in. (15 cm)
Depth: 6-130 ft. (2-40 m)
Distribution: Indo-West Pacific
]]>Sun, 05 Apr 2026 10:36:28 -0400https://reefguide.org/rigidshrimpfish.htmlhttps://reefguide.org/rigidshrimpfish.html
Rigid Shrimpfish
Scientific Name: Centriscus scutatus
Order: Syngnathiformes
Family: Centriscidae
Category: Shrimpfishes
Size: Up to 5.5 in. (14 cm)
Depth: 3-75 ft. (1-23 m)
Distribution: Indo-West Pacific
]]>Sun, 05 Apr 2026 10:35:48 -0400https://reefguide.org/trumpet.htmlhttps://reefguide.org/trumpet.html
Atlantic Trumpetfish
Scientific Name: Aulostomus maculatus
Order: Syngnathiformes
Family: Aulostomidae (Trumpetfishes)
Category: Trumpetfishes
Size: 1 to 3 ft. (30 to 90 cm)
Depth: 15-80 ft. (5-25 m)
Distribution: Caribbean, Bahamas, Florida, Bermuda
]]>Sun, 05 Apr 2026 10:34:49 -0400https://reefguide.org/seaspider.htmlhttps://reefguide.org/seaspider.html
Sea Spider
Order: Pantopoda (Sea Spiders)
Category: Sea Spiders
Size: Up to 12 in. (30 cm)
Depth: 6-250 ft. (2-75 m)
Distribution: Circumtropical
]]>Sun, 05 Apr 2026 09:49:10 -0400https://reefguide.org/eviotaprasites.htmlhttps://reefguide.org/eviotaprasites.html
Red and Whitespotted Dwarfgoby
Scientific Name: Eviota prasites
Order: Gobiiformes
Family: Gobiidae (Gobies)
Category: Gobies
Size: 0.5 to 1 in. (1.25 to 2.5 cm)
Depth: 15-70 ft. (5-21 m)
Distribution: West Pacific, Great Barrier Reef, French Polynesia
]]>Fri, 03 Apr 2026 23:21:37 -0400https://reefguide.org/amblyeleotrisdiagonalis.htmlhttps://reefguide.org/amblyeleotrisdiagonalis.html
Slantbar Shrimpgoby
Scientific Name: Amblyeleotris diagonalis
Order: Gobiiformes
Family: Gobiidae (Gobies)
Category: Gobies
Size: Up to 3.5 in. (9 cm)
Depth: 15-100 ft. (5-30 m)
Distribution: Indo-West Pacific, Indonesia, Red Sea, Great Barrier Reef
]]>Fri, 03 Apr 2026 23:19:20 -0400https://reefguide.org/amblyeleotrisrandalli.htmlhttps://reefguide.org/amblyeleotrisrandalli.html
Randall's Shrimpgoby
Scientific Name: Amblyeleotris randalli
Order: Gobiiformes
Family: Gobiidae (Gobies)
Category: Gobies
Size: Up to 3.5 in. (9 cm)
Depth: 30-150 ft. (10-45 m)
Distribution: West Pacific
]]>Fri, 03 Apr 2026 23:17:40 -0400https://reefguide.org/hamopontoniacorallicola.htmlhttps://reefguide.org/hamopontoniacorallicola.html
Egg Shell Shrimp
Scientific Name: Hamopontonia fungicola
Order: Decapoda (Decapods)
Family: Palaemonidae (Commensal Shrimps)
Category: Commensal Shrimps
Size: Up to 1 in. (2.5 cm)
Depth: 20-100 ft. (6-30 m)
Distribution: Indonesia, Philippines, Australia
]]>Fri, 03 Apr 2026 19:27:51 -0400https://reefguide.org/alatinaalata.htmlhttps://reefguide.org/alatinaalata.html
Sea Wasp
Scientific Name: Alatina alata
Order: Carybdeida
Family: Alatinidae
Category: Box Jellyfishes
Distribution: Caribbean, South Florida, Pacific, Hawaii
]]>Thu, 02 Apr 2026 20:52:47 -0400https://reefguide.org/hippocampuskuda.htmlhttps://reefguide.org/hippocampuskuda.html
Common Seahorse
Scientific Name: Hippocampus kuda
Order: Syngnathiformes
Family: Syngnathidae (Seahorses and Pipefishes)
Category: Seahorses
Size: Up to 6 in. (15 cm)
Depth: 3-30 ft. (1-10 m)
Distribution: Indo-Pacific
]]>Wed, 18 Mar 2026 14:20:05 -0400https://reefguide.org/hippocampuskelloggi.htmlhttps://reefguide.org/hippocampuskelloggi.html
Great Seahorse
Scientific Name: Hippocampus kelloggi
Order: Syngnathiformes
Family: Syngnathidae (Seahorses and Pipefishes)
Category: Seahorses
Size: Up to 6 in. (15 cm)
Distribution: Indonesia, Philippines
]]>Wed, 18 Mar 2026 14:13:07 -0400https://reefguide.org/hippocampusspinosissimus.htmlhttps://reefguide.org/hippocampusspinosissimus.html
Hedgehog Seahorse
Scientific Name: Hippocampus spinosissimus
Order: Syngnathiformes
Family: Syngnathidae (Seahorses and Pipefishes)
Category: Seahorses
Size: Up to 6 in. (15 cm)
Distribution: Indonesia, Australia, Philippines, Malaysia, Papua New Guinea
]]>Wed, 18 Mar 2026 10:17:55 -0400https://reefguide.org/longibranchusputnami.htmlhttps://reefguide.org/longibranchusputnami.html
Dark Longibranchus
Scientific Name: Longibranchus putnami
Order: Nudibranchia (Nudibranchs)
Family: Eubranchidae
Category: Aeolid Nudibranchs
Size: Up to 0.75 in. (2 cm)
Distribution: Indonesia, Philippines, Malaysia
]]>Sun, 15 Mar 2026 22:56:25 -0400https://reefguide.org/eubranchussp2.htmlhttps://reefguide.org/eubranchussp2.html
Brown-Stripe Eubranchus
Scientific Name: Eubranchus sp. 2
Order: Nudibranchia (Nudibranchs)
Family: Eubranchidae
Category: Aeolid Nudibranchs
Size: Up to 0.75 in. (2 cm)
Distribution: Indonesia, Philippines, Malaysia
]]>Sun, 15 Mar 2026 22:56:25 -0400https://reefguide.org/tenelliasp1.htmlhttps://reefguide.org/tenelliasp1.html
Tenellia sp. 1
Scientific Name: Tenellia sp. 1
Order: Nudibranchia (Nudibranchs)
Family: Trinchesiidae
Category: Aeolid Nudibranchs
Size: Up to 0.25 in. (7 mm)
Distribution: Indo-West Pacific
]]>Sun, 15 Mar 2026 22:16:51 -0400https://reefguide.org/phyllidiaocellata.htmlhttps://reefguide.org/phyllidiaocellata.html
Ocellated Phyllidia
Scientific Name: Phyllidia ocellata
Order: Doridida
Family: Phyllidiidae
Category: Dorid Nudibranchs
Size: Up to 2.5 in. (7 cm)
Depth: 3-150 ft. (1-45 m)
Distribution: Australia, Indo-Pacific, Fiji, Malaysia
]]>Sun, 15 Mar 2026 20:28:37 -0400https://reefguide.org/alpheusochrostriatus.htmlhttps://reefguide.org/alpheusochrostriatus.html
White Saddle Snapping Shrimp
Scientific Name: Alpheus ochrostriatus
Order: Decapoda (Decapods)
Family: Alpheidae (Snapping Shrimps)
Category: Snapping Shrimps
Size: Up to 3 in. (7 cm)
Distribution: Indo-Pacific
]]>Sun, 15 Mar 2026 20:25:41 -0400https://reefguide.org/hypselodoristryoni.htmlhttps://reefguide.org/hypselodoristryoni.html
Tryon's Risbecia
Scientific Name: Hypselodoris tryoni
Order: Doridida
Family: Chromodorididae
Category: Dorid Nudibranchs
Size: Up to 2.75 in. (7 cm)
Depth: 10-100 ft. (3-30 m)
Distribution: Indonesia, Indo-Pacific, Great Barrier Reef, French Polynesia, Taiwan
]]>Sun, 15 Mar 2026 20:19:14 -0400https://reefguide.org/chromodoriscoi.htmlhttps://reefguide.org/chromodoriscoi.html
Co's Chromodoris
Scientific Name: Goniobranchus coi
Order: Doridida
Family: Chromodorididae
Category: Dorid Nudibranchs
Size: 1 to 2 in. (2.5 to 5 cm)
Depth: 10-100 ft. (3-30 m)
Distribution: West Pacific, Australia
]]>Sun, 15 Mar 2026 20:06:27 -0400https://reefguide.org/minoustrachycephalus.htmlhttps://reefguide.org/minoustrachycephalus.html
Striped Stinger
Scientific Name: Minous trachycephalus
Order: Perciformes
Family: Synanceiidae (Stonefishes)
Category: Stonefishes
Size: Up to 4.5 in. (12 cm)
Distribution: Indonesia, Philippines
]]>Sun, 15 Mar 2026 18:50:54 -0400https://reefguide.org/onigociaspinosa.htmlhttps://reefguide.org/onigociaspinosa.html
Spiny Flathead
Scientific Name: Onigocia spinosa
Order: Perciformes
Family: Platycephalidae (Flatheads)
Category: Flatheads
Size: Up to 5 in. (13 cm)
Distribution: Northern Australia, Indonesia, Philippines
]]>Sun, 15 Mar 2026 18:21:41 -0400https://reefguide.org/speckledbutterflyfish.htmlhttps://reefguide.org/speckledbutterflyfish.html
Speckled Butterflyfish
Scientific Name: Chaetodon citrinellus
Order: Acanthuriformes
Family: Chaetodontidae (Butterflyfishes)
Category: Butterflyfishes
Size: 3 to 5 in. (8 to 12 cm)
Depth: 3-50 ft. (1-15 m)
Distribution: Indo-Pacific, Hawaii, French Polynesia, Australia
]]>Fri, 13 Mar 2026 15:03:14 -0400https://reefguide.org/spottedboxfish.htmlhttps://reefguide.org/spottedboxfish.html
Spotted Boxfish
Scientific Name: Ostracion meleagris
Order: Tetraodontiformes
Family: Ostraciidae (Boxfishes)
Category: Boxfishes
Size: 4 to 7 in. (10 to 18 cm)
Depth: 3-90 ft. (1-27 m)
Distribution: Indo-Pacific, Hawaii, Pacific Coast of Mexico to Panama, French Polynesia, Great Barrier Reef
]]>Thu, 12 Mar 2026 17:37:52 -0400https://reefguide.org/chevronedbutterflyfish.htmlhttps://reefguide.org/chevronedbutterflyfish.html
Chevroned Butterflyfish
Scientific Name: Chaetodon trifascialis
Order: Acanthuriformes
Family: Chaetodontidae (Butterflyfishes)
Category: Butterflyfishes
Size: 5 to 7 in. (13 to 18 cm)
Depth: 3-30 ft. (1-10 m)
Distribution: Indo-Pacific, Red Sea, Great Barrier Reef, French Polynesia
]]>Thu, 12 Mar 2026 17:35:19 -0400https://reefguide.org/neopomacentrusviolascens.htmlhttps://reefguide.org/neopomacentrusviolascens.html
Violet Demoiselle
Scientific Name: Neopomacentrus violascens
Order: Ovalentaria
Family: Pomacentridae (Damselfishes)
Category: Damselfishes
Size: Up to 2.5 in. (6.5 cm)
Distribution: Indonesia, Philippines
]]>Thu, 12 Mar 2026 17:18:59 -0400https://reefguide.org/valencienneahelsdingenii.htmlhttps://reefguide.org/valencienneahelsdingenii.html
Twostripe Goby
Scientific Name: Valenciennea helsdingenii
Order: Gobiiformes
Family: Gobiidae (Gobies)
Category: Gobies
Size: Up to 6 in. (15 cm)
Distribution: Indo-Pacific, Red Sea, Great Barrier Reef, French Polynesia
]]>Thu, 12 Mar 2026 16:00:45 -0400https://reefguide.org/variolaalbimarginata.htmlhttps://reefguide.org/variolaalbimarginata.html
White-Edged Lyretail
Scientific Name: Variola albimarginata
Order: Perciformes
Family: Epinephelidae (Groupers)
Category: Groupers
Size: Up to 2 ft. (60cm)
Depth: 15-600 ft. (5-180 m)
Distribution: Indo-West Pacific
]]>Thu, 12 Mar 2026 15:41:19 -0400https://reefguide.org/redspottedsandperch.htmlhttps://reefguide.org/redspottedsandperch.html
Redspotted Sandperch
Scientific Name: Parapercis schauinslandii
Order: Perciformes
Family: Pinguipedidae (Sandperches)
Category: Sandperches
Size: up to 5 in. (13 cm)
Depth: 20-150 ft. (6-45 m)
Distribution: Indo-Pacific, Hawaii, Great Barrier Reef, French Polynesia
]]>Thu, 12 Mar 2026 15:39:32 -0400https://reefguide.org/yellowbarredjawfish.htmlhttps://reefguide.org/yellowbarredjawfish.html
Yellowbarred Jawfish
Scientific Name: Opistognathus randalli
Order: Ovalentaria
Family: Opistognathidae (Jawfishes)
Category: Jawfishes
Size: Up to 4.5 in. (11 cm)
Depth: 10-180 ft. (3-55 m)
Distribution: Indonesia, Philippines
]]>Thu, 12 Mar 2026 15:34:44 -0400https://reefguide.org/parapteroisheterura.htmlhttps://reefguide.org/parapteroisheterura.html
Gurnard Lionfish
Scientific Name: Parapterois heterura
Order: Perciformes
Family: Scorpaenidae
Category: Lionfishes
Size: Up to 15 in. (38 cm)
Depth: 10-300 ft. (3-90 m)
Distribution: Philippines, Indonesia, Taiwan
]]>Thu, 12 Mar 2026 15:31:57 -0400https://reefguide.org/schoolingbannerfish.htmlhttps://reefguide.org/schoolingbannerfish.html
Schooling Bannerfish
Scientific Name: Heniochus diphreutes
Order: Acanthuriformes
Family: Chaetodontidae (Butterflyfishes)
Category: Butterflyfishes
Size: 5 to 8 in. (13 to 20 cm)
Depth: 15-60 ft. (5-18 m)
Distribution: Indo-Pacific, Hawaii, Red Sea
]]>Thu, 12 Mar 2026 15:30:01 -0400https://reefguide.org/undulatedeel.htmlhttps://reefguide.org/undulatedeel.html
Undulated Moray Eel
Scientific Name: Gymnothorax undulatus
Order: Anguilliformes (Eels)
Family: Muraenidae (Moray Eels)
Category: Moray Eels
Size: 3 to 5 ft. (90 cm to 1.5 m)
Depth: 3-15 ft. (1-5 m)
Distribution: Indo-Pacific, Hawaii, Red Sea, Pacific Coast of Costa Rica to Ecuador, French Polynesia
]]>Thu, 12 Mar 2026 15:24:52 -0400https://reefguide.org/gymnodorissubflava.htmlhttps://reefguide.org/gymnodorissubflava.html
Ridged Gymnodoris
Scientific Name: Gymnodoris crocea
Order: Doridida
Family: Polyceridae
Category: Dorid Nudibranchs
Size: Up to 1 in. (2.5 cm)
Depth: 10-40 ft. (3-12 m)
Distribution: Indonesia, Philippines
]]>Wed, 11 Mar 2026 17:57:29 -0400https://reefguide.org/ariosomafasciatum.htmlhttps://reefguide.org/ariosomafasciatum.html
Barred Sand Conger
Scientific Name: Ariosoma fasciatum
Order: Anguilliformes (Eels)
Family: Congridae (Conger Eels)
Category: Conger Eels
Size: Up to 23 in. (60 cm)
Distribution: Indonesia, Philippines
]]>Wed, 11 Mar 2026 17:26:24 -0400https://reefguide.org/ophichthusbonaparti.htmlhttps://reefguide.org/ophichthusbonaparti.html
Napoleon Snake Eel
Scientific Name: Ophichthus bonaparti
Order: Anguilliformes (Eels)
Family: Ophichthidae (Snake Eels)
Category: Snake Eels
Size: Up to 2.5 ft (75 cm)
Depth: 15-80 ft. (5-25 m)
Distribution: Indo-Pacific, Great Barrier Reef, French Polynesia, Taiwan
]]>Wed, 11 Mar 2026 17:10:21 -0400https://reefguide.org/dermatobranchussp1.htmlhttps://reefguide.org/dermatobranchussp1.html
Dermatobranchus sp. 1
Scientific Name: Dermatobranchus sp. 1
Order: Nudibranchia (Nudibranchs)
Family: Arminidae (Arminid Nudibranchs)
Category: Arminid Nudibranchs
Size: Up to 1 in. (2.5 cm)
Distribution: Indonesia
]]>Wed, 11 Mar 2026 17:06:46 -0400https://reefguide.org/shorttailedpipefish.htmlhttps://reefguide.org/shorttailedpipefish.html
Short-Tailed Pipefish
Scientific Name: Trachyrhamphus bicoarctatus
Order: Syngnathiformes
Family: Syngnathidae (Seahorses and Pipefishes)
Category: Pipefishes
Size: Up to 16 in. (40 cm)
Depth: 10-75 ft. (3-23 m)
Distribution: Indo-West Pacific, Red Sea, Australia
]]>Tue, 10 Mar 2026 17:50:39 -0400https://reefguide.org/mimicfilefish.htmlhttps://reefguide.org/mimicfilefish.html
Mimic Filefish
Scientific Name: Paraluteres prionurus
Order: Tetraodontiformes
Family: Monacanthidae (Filefishes)
Category: Filefishes
Size: 2 to 4 in. (5 to 10 cm)
Depth: 3-80 ft. (1-25 m)
Distribution: Indo-Pacific, Great Barrier Reef, Fiji
]]>Tue, 10 Mar 2026 17:47:04 -0400https://reefguide.org/lionspawseacucumbers.htmlhttps://reefguide.org/lionspawseacucumbers.html
Lion's Paw Sea Cucumbers
Scientific Name: Euapta godeffroyi
Order: Apodida
Family: Synaptidae
Category: Sea Cucumbers
Size: Up to 2 ft. (60 cm)
Distribution: Indo-Pacific, Hawaii
]]>Tue, 10 Mar 2026 17:23:09 -0400https://reefguide.org/turrisspectabilis.htmlhttps://reefguide.org/turrisspectabilis.html
Turris cf. spectabilis
Scientific Name: Turris cf. spectabilis
Order: Neogastropoda
Family: Turridae (Turrids Shells)
Category: Turrids Shells
Distribution: French Polynesia
]]>Tue, 10 Mar 2026 17:16:01 -0400https://reefguide.org/hypoplectrusaffini.htmlhttps://reefguide.org/hypoplectrusaffini.html
Bluelip Hamlet
Scientific Name: Hypoplectrus affinis
Order: Perciformes
Family: Serranidae (Seabasses)
Category: Hamlets
Size: 3 to 6 in. (8 to 15 cm)
Depth: 10-40 ft. (3-12 m)
Distribution: Caribbean, Florida Keys
]]>Mon, 09 Mar 2026 17:05:12 -0400https://reefguide.org/threadfinsanddiver.htmlhttps://reefguide.org/threadfinsanddiver.html
Threadfin Sand Diver
Scientific Name: Trichonotus elegans
Order: Gobiiformes
Family: Trichonotidae (Sand Divers)
Category: Sand Divers
Size: Up to 7 in. (18 cm)
Depth: 30-140 ft. (10-43 m)
Distribution: Indo-West Pacific
]]>Mon, 09 Mar 2026 17:02:05 -0400https://reefguide.org/blacksaddledtoby.htmlhttps://reefguide.org/blacksaddledtoby.html
Black-Saddled Toby
Scientific Name: Canthigaster valentini
Order: Tetraodontiformes
Family: Tetraodontidae (Pufferfishes)
Category: Pufferfishes
Size: 2 to 3.5 in. (5 to 9 cm)
Depth: 5-150 ft. (2-45 m)
Distribution: Indo-Pacific, Red Sea, Australia, French Polynesia, Fiji
]]>Mon, 09 Mar 2026 13:37:17 -0400https://reefguide.org/ferdauiaferdau.htmlhttps://reefguide.org/ferdauiaferdau.html
Blue Trevally
Scientific Name: Ferdauia ferdau
Order: Carangiformes
Family: Carangidae (Jacks)
Category: Jacks
Size: Up to 2.25 ft. (70 cm)
Depth: 30-180 ft. (10-55 m)
Distribution: Indo-Pacific, Red Sea, Hawaii, Australia, French Polynesia
]]>Mon, 09 Mar 2026 13:32:28 -0400https://reefguide.org/mappuffer.htmlhttps://reefguide.org/mappuffer.html
Map Puffer
Scientific Name: Arothron mappa
Order: Tetraodontiformes
Family: Tetraodontidae (Pufferfishes)
Category: Pufferfishes
Size: Up to 2 ft. (60 cm)
Depth: 15-100 ft. (5-30 m)
Distribution: Indo-West Pacific, Great Barrier Reef
]]>Fri, 06 Mar 2026 18:43:23 -0500https://reefguide.org/nasoannulatus.htmlhttps://reefguide.org/nasoannulatus.html
Whitemargin Unicornfish
Scientific Name: Naso annulatus
Order: Acanthuriformes
Family: Acanthuridae (Surgeonfishes)
Category: Unicornfishes
Size: Up to 39 in. (100 cm)
Depth: 50-200 ft. (15-60 m)
Distribution: Indo-Pacific, Hawaii, French Polynesia
]]>Fri, 06 Mar 2026 18:34:49 -0500https://reefguide.org/thecacerasp2.htmlhttps://reefguide.org/thecacerasp2.html
Black-Horn Tecacera
Scientific Name: Thecacera sp.2
Order: Doridida
Family: Polyceridae
Category: Dorid Nudibranchs
Size: Up to 1.5 in. (4 cm)
Distribution: Indonesia, Philippines
]]>Fri, 06 Mar 2026 18:16:06 -0500https://reefguide.org/petroscirtesmitratus.htmlhttps://reefguide.org/petroscirtesmitratus.html
Highfin Fangblenny
Scientific Name: Petroscirtes mitratus
Order: Blenniiformes
Family: Blenniidae (Combtooth Blennies)
Category: Combtooth Blennies
Size: Up to 3 in. (7.5 cm)
Depth: 5-30 ft. (2-10 m)
Distribution: Indo-Pacific, Red Sea, Australia, Micronesia, Fiji
]]>Fri, 06 Mar 2026 17:45:39 -0500https://reefguide.org/leafscorpionfish.htmlhttps://reefguide.org/leafscorpionfish.html
Leaf Scorpionfish
Scientific Name: Taenianotus triacanthus
Order: Perciformes
Family: Scorpaenidae
Category: Scorpionfishes
Size: 2 to 4 in. (5 to 10 cm)
Depth: 30-200 ft. (10-60 m)
Distribution: Indo-Pacific, Hawaii, French Polynesia
]]>Tue, 03 Mar 2026 23:55:03 -0500https://reefguide.org/monomiapetrea.htmlhttps://reefguide.org/monomiapetrea.html
Red Monomia
Scientific Name: Monomia petrea
Order: Decapoda (Decapods)
Family: Portunidae (Swimming Crabs)
Category: Swimming Crabs
Distribution: Indo-Pacific
]]>Tue, 03 Mar 2026 23:23:09 -0500https://reefguide.org/twospotwrasse.htmlhttps://reefguide.org/twospotwrasse.html
Twospot Wrasse
Scientific Name: Oxycheilinus bimaculatus
Order: Eupercaria
Family: Labridae (Wrasses)
Category: Wrasses
Size: Up to 6 in. (15 cm)
Depth: 6-200 ft. (2-60 m)
Distribution: Indo-Pacific, Hawaii, Australia, Red Sea, French Polynesia
]]>Tue, 03 Mar 2026 22:01:08 -0500https://reefguide.org/dotogreenamyeri.htmlhttps://reefguide.org/dotogreenamyeri.html
Donut Nudibranch
Scientific Name: Doto greenamyeri
Order: Nudibranchia (Nudibranchs)
Family: Dotidae (Dendronotid Nudibranchs)
Category: Dendronotid Nudibranchs
Size: Up to 0.5 in. (1.5 cm)
Distribution: Indonesia, Papua New Guinea
]]>Tue, 03 Mar 2026 21:56:04 -0500https://reefguide.org/thyccrystallina.htmlhttps://reefguide.org/thyccrystallina.html
Crystalline Sea Star Snail
Scientific Name: Thyca crystallina
Order: Littorinimorpha
Family: Eulimidae (Parasitic Snails)
Category: Parasitic Snails
Size: Up to 1/8 in. (4 mm)
Depth: 15-100 ft. (5-30 m)
Distribution: Indo-Pacific, Hawaii
]]>Tue, 03 Mar 2026 21:53:16 -0500https://reefguide.org/macropharyngodonornatus.htmlhttps://reefguide.org/macropharyngodonornatus.html
Ornate Leopard Wrasse
Scientific Name: Macropharyngodon ornatus
Order: Eupercaria
Family: Labridae (Wrasses)
Category: Wrasses
Size: Up to 4.25 in. (11 cm)
Depth: 10-100 ft. (3-30 m)
Distribution: Indonesia, Malaysia, Papua New Guinea
]]>Tue, 03 Mar 2026 21:51:39 -0500https://reefguide.org/dotoussi.htmlhttps://reefguide.org/dotoussi.html
Grape Doto
Scientific Name: Doto ussi
Order: Nudibranchia (Nudibranchs)
Family: Dotidae (Dendronotid Nudibranchs)
Category: Dendronotid Nudibranchs
Size: Up to 1.25 in. (30 cm)
Distribution: Indonesia, Philippines
]]>Tue, 03 Mar 2026 21:04:20 -0500https://reefguide.org/cerianthusfiliformis.htmlhttps://reefguide.org/cerianthusfiliformis.html
Cerianthus sp. 1
Scientific Name: Cerianthus sp. 1
Order: Ceriantharia (Tube-Dwelling Anemones)
Family: Cerianthidae (Tube-Dwelling Anemones)
Category: Tube-Dwelling Anemones
Size: Up to 10 in. (25 cm)
Distribution: Indonesia, Philippines
]]>Tue, 03 Mar 2026 20:52:38 -0500https://reefguide.org/shortfinlionfish.htmlhttps://reefguide.org/shortfinlionfish.html
Shortfin Lionfish
Scientific Name: Neochirus brachyptera
Order: Perciformes
Family: Scorpaenidae
Category: Lionfishes
Size: Up to 7 in. (18 cm)
Depth: 6-100 ft. (2-30 m)
Distribution: Indo-West Pacific, Red Sea, Australia
]]>Tue, 03 Mar 2026 20:32:24 -0500https://reefguide.org/blackspottedpuffer.htmlhttps://reefguide.org/blackspottedpuffer.html
Blackspotted Puffer
Scientific Name: Arothron nigropunctatus
Order: Tetraodontiformes
Family: Tetraodontidae (Pufferfishes)
Category: Pufferfishes
Size: 10 to 13 in. (25 to 33 cm)
Depth: 10-75 ft. (3-23 m)
Distribution: Indo-Pacific, Great Barrier Reef
]]>Tue, 03 Mar 2026 20:26:06 -0500https://reefguide.org/scorpaenopsisobtusa.htmlhttps://reefguide.org/scorpaenopsisobtusa.html
Bluntsnout scorpionfish
Scientific Name: Scorpaenopsis obtusa
Order: Perciformes
Family: Scorpaenidae
Category: Scorpionfishes
Size: Up to 4 in. (10 cm)
Distribution: Indonesia, Philippines
]]>Tue, 03 Mar 2026 20:23:13 -0500https://reefguide.org/nasobrachycentron.htmlhttps://reefguide.org/nasobrachycentron.html
Humpback Unicornfish
Scientific Name: Naso brachycentron
Order: Acanthuriformes
Family: Acanthuridae (Surgeonfishes)
Category: Unicornfishes
Size: Up to 35 in. (90 cm)
Depth: 20-120 ft. (6-37 m)
Distribution: Indo-Pacific, Southern Caribbean, Palau, Micronesia, Great Barrier Reef, Fiji, French Polynesia
]]>Mon, 02 Mar 2026 23:38:17 -0500https://reefguide.org/nasocaesius.htmlhttps://reefguide.org/nasocaesius.html
Gray Unicornfish
Scientific Name: Naso caesius
Order: Acanthuriformes
Family: Acanthuridae (Surgeonfishes)
Category: Unicornfishes
Size: Up to 18 in. (45 cm)
Depth: 10-150 ft. (3-45 m)
Distribution: Philippines, Indonesia, Papua New Guinea
]]>Mon, 02 Mar 2026 22:42:46 -0500https://reefguide.org/cirrhitichthysaprinus.htmlhttps://reefguide.org/cirrhitichthysaprinus.html
Threadfin Hawkfish
Scientific Name: Cirrhitichthys aprinus
Order: Centrarchiformes
Family: Cirrhitidae (Hawkfishes)
Category: Hawkfishes
Size: Up to 4 in. (10 cm)
Depth: 15-130 ft. (5-40 m)
Distribution: Indonesia, Australia, Philippines, Papua New Guinea
]]>Mon, 02 Mar 2026 22:33:28 -0500https://reefguide.org/rhyssoplaxdensilirata.htmlhttps://reefguide.org/rhyssoplaxdensilirata.html
Densilirata Chiton
Scientific Name: Rhyssoplax densilirata
Order: Chitonida
Family: Chitonidae
Category: Chitons
Size: Up to 2 in. (5 cm)
Distribution: Philippines, Indonesia, Papua New Guinea
]]>Mon, 02 Mar 2026 22:12:10 -0500https://reefguide.org/chloeiaparva.htmlhttps://reefguide.org/chloeiaparva.html
Chloeia bemisae
Scientific Name: Chloeia bemisae
Order: Amphinomida
Family: Amphinomidae (Fireworms)
Category: Fireworms
Size: Up to 1 in. (2.5 cm)
Distribution: Indo-West Pacific
]]>Mon, 02 Mar 2026 22:03:25 -0500https://reefguide.org/alpheuscfpacificus.htmlhttps://reefguide.org/alpheuscfpacificus.html
Pacific Snapping Shrimp
Scientific Name: Alpheus cf. pacificus
Order: Decapoda (Decapods)
Family: Alpheidae (Snapping Shrimps)
Category: Snapping Shrimps
Distribution: Indo-West Pacific
]]>Mon, 02 Mar 2026 21:47:14 -0500https://reefguide.org/cephalopholissonnerati.htmlhttps://reefguide.org/cephalopholissonnerati.html
Tomato Grouper
Scientific Name: Cephalopholis sonnerati
Order: Perciformes
Family: Epinephelidae (Groupers)
Category: Groupers
Size: Up to 20 in. (50 cm)
Depth: 30-400 ft. (10-120 m)
Distribution: Indo-Pacific
]]>Mon, 02 Mar 2026 21:20:30 -0500https://reefguide.org/epinephelusareolatus.htmlhttps://reefguide.org/epinephelusareolatus.html
Areolate Grouper
Scientific Name: Epinephelus areolatus
Order: Perciformes
Family: Epinephelidae (Groupers)
Category: Groupers
Size: Up to 16in. (40 cm)
Depth: 30-600 ft. (10-180 m)
Distribution: Indo-Pacific, Fiji, Australia, Taiwan
]]>Mon, 02 Mar 2026 21:14:30 -0500https://reefguide.org/turbinariaornata.htmlhttps://reefguide.org/turbinariaornata.html
Ornate Turbanweed
Scientific Name: Turbinaria ornata
Order: Fucales
Family: Sargassaceae
Category: Brown Algae
Distribution: Indo-Pacific, Red Sea, Australia, Hawaii, French Polynesia
]]>Mon, 02 Mar 2026 20:54:33 -0500https://reefguide.org/myripristisrobusta.htmlhttps://reefguide.org/myripristisrobusta.html
Robust Soldierfish
Scientific Name: Myripristis robusta
Order: Holocentriformes
Family: Holocentridae (Squirrelfishes and Soldierfishes)
Category: Soldierfishes
Size: Up to 8.75 in. (22 cm)
Distribution: Indonesia, Philippines
]]>Sun, 01 Mar 2026 20:21:30 -0500https://reefguide.org/pacificcrowntoby.htmlhttps://reefguide.org/pacificcrowntoby.html
Pacific Crown Toby
Scientific Name: Canthigaster axiologus
Order: Tetraodontiformes
Family: Tetraodontidae (Pufferfishes)
Category: Pufferfishes
Size: Up to 5 in. (13 cm)
Depth: 30-200 ft. (10-60 m)
Distribution: Indo-West Pacific
]]>Sun, 01 Mar 2026 19:00:28 -0500https://reefguide.org/spinyseahorse.htmlhttps://reefguide.org/spinyseahorse.html
Thorny seahorse
Scientific Name: Hippocampus histrix
Order: Syngnathiformes
Family: Syngnathidae (Seahorses and Pipefishes)
Category: Seahorses
Size: Up to 6 in. (15 cm)
Depth: 30-80 ft. (10-25 m)
Distribution: Indo-West Pacific, French Polynesia
]]>Sun, 01 Mar 2026 18:56:46 -0500https://reefguide.org/asterropteryxsemipunctata.htmlhttps://reefguide.org/asterropteryxsemipunctata.html
Starry Goby
Scientific Name: Asterropteryx semipunctata
Order: Gobiiformes
Family: Gobiidae (Gobies)
Category: Gobies
Size: Up to 2 in. (5 cm)
Depth: 3-45 ft. (1-15 m)
Distribution: Indo-Pacific, Great Barrier Reef, Fiji
]]>Sun, 01 Mar 2026 18:54:58 -0500https://reefguide.org/disappearingwrasse.htmlhttps://reefguide.org/disappearingwrasse.html
Disappearing Wrasse
Scientific Name: Pseudocheilinus evanidus
Order: Eupercaria
Family: Labridae (Wrasses)
Category: Wrasses
Size: Up to 3 in. (8 cm)
Depth: 20-140 ft. (6-43 m)
Distribution: Indo-Pacific, Red Sea, Hawaii, Australia, French Polynesia
]]>Sun, 01 Mar 2026 17:18:43 -0500https://reefguide.org/lybiatessellata.htmlhttps://reefguide.org/lybiatessellata.html
Mosaic Boxer Crab
Scientific Name: Lybia tessellata
Order: Decapoda (Decapods)
Family: Xanthidae (Mud Crabs)
Category: Mud Crabs
Size: Up to 1 in. (2.5 cm)
Depth: 6-40 ft. (2-12 m)
Distribution: Indo-West Pacific
]]>Sun, 01 Mar 2026 17:02:06 -0500https://reefguide.org/odontodactyluslatirostris.htmlhttps://reefguide.org/odontodactyluslatirostris.html
Pink-Eared Mantis Shrimp
Scientific Name: Odontodactylus latirostris
Order: Stomatopoda
Family: Odontodactylidae
Category: Mantis Shrimps
Size: Up to 3 in. (8 cm)
Distribution: Great Barrier Reef, Indonesia, Philippines
]]>Sun, 01 Mar 2026 16:59:59 -0500https://reefguide.org/lissocarcinuslaevis.htmlhttps://reefguide.org/lissocarcinuslaevis.html
Harlequin Swimming Crab
Scientific Name: Lissocarcinus laevis
Order: Decapoda (Decapods)
Family: Portunidae (Swimming Crabs)
Category: Swimming Crabs
Size: Up to 5/8 in. (1.5 cm)
Distribution: Indo-Pacific
]]>Sun, 01 Mar 2026 16:48:59 -0500https://reefguide.org/canthigasterbennetti.htmlhttps://reefguide.org/canthigasterbennetti.html
Whitebelly Toby
Scientific Name: Canthigaster bennetti
Order: Tetraodontiformes
Family: Tetraodontidae (Pufferfishes)
Category: Pufferfishes
Size: Up to 5/8 in. (1.5 cm)
Distribution: Indo-Pacific, French Polynesia
]]>Sun, 01 Mar 2026 16:41:34 -0500https://reefguide.org/thorunnahalourga.htmlhttps://reefguide.org/thorunnahalourga.html
Sea-Purple Thorunna
Scientific Name: Thorunna halourga
Order: Doridida
Family: Chromodorididae
Category: Dorid Nudibranchs
Size: up to 1 in. (2.5 cm)
Distribution: West Pacific, Indonesia, Great Barrier Reef
]]>Sun, 01 Mar 2026 16:25:13 -0500https://reefguide.org/pterelectromaphysoides.htmlhttps://reefguide.org/pterelectromaphysoides.html
Zebra Wing Oyster
Scientific Name: Pterelectroma physoides
Order: Ostreida (Oysters and Allies)
Family: Pteriidae (Feather Oysters)
Category: Feather Oysters
Size: Up to 1.25 in. (3 cm)
Depth: 3-250 ft. (1-75 m)
Distribution: Indonesia, Philippines, Australia, New Caledonia
]]>Sun, 01 Mar 2026 15:56:51 -0500