Meiacanthus atrodorsalis (Günther, 1877)
Forktail blenny
Yellowtail poison-fang blenny
Meiacanthus atrodorsalis
photo by Randall, J.E.

Family:  Blenniidae (Combtooth blennies), subfamily: Blenniinae
Max. size:  11 cm TL (male/unsexed)
Environment:  reef-associated; marine; depth range 0 - 30 m
Distribution:  Western Pacific: Bali and the Philippines east to Samoa, north to Ryukyu Islands, south to Rowley Shoals, the southern Great Barrier Reef, and New Caledonia; throughout Micronesia. Replaced by the uniformly yellow species ovalauensis in Fiji, and by Meiacanthus tongaensis in Tonga (Ref. 37816).
Diagnosis:  Dorsal spines (total): 4-4; Dorsal soft rays (total): 25-28; Anal spines: 2-2; Anal soft rays: 15-18. Identified by the blue-edged diagonal black line from the eye and yellow dorsal fin or back. Adults have long filaments on the caudal fin tips; length without filaments (Ref. 48636).
Biology:  Adults are found solitary or in pairs (Ref. 90102) in lagoon and seaward reefs below the surge zone to 30 m depth (Ref. 9710). A common species, often seen along slopes and drop-offs, adults sometimes in small groups (Ref. 48636). Feed on zooplankton and also on small benthic invertebrates. Inoffensive, but immune from predation (Ref. 9710). Oviparous. Eggs are demersal and adhesive (Ref. 205), and are attached to the substrate via a filamentous, adhesive pad or pedestal (Ref. 94114). Larvae are planktonic, often found in shallow, coastal waters (Ref. 94114). Mimicked by Ecsenius bicolor and Plagiotremus laudanus (Ref. 90102).
IUCN Red List Status: Least Concern (LC); Date assessed: 28 March 2009 Ref. (130435)
Threat to humans:  venomous
Country info:  Museum: Kapingamarangi Atoll, Caroline Is., CAS 28905 - 28915. Ifalik, ANSP 124872: CAS 24698, 28902 - 28904. Truk, BPBM 7448. Ponape, CAS 28916, 28917; USNM 223223. Kosrae, Lelu Is., BPBM 28225 (Ref. 7401). Also Ref. 90102.


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