Gymnothorax pseudothyrsoideus (Bleeker, 1853)
Highfin moray
Malibanos,  Bakasi,  Hagmang,  Hangit,  Ubod
Gymnothorax pseudothyrsoideus
photo by Greenfield, J.

Family:  Muraenidae (Moray eels), subfamily: Muraeninae
Max. size:  80 cm TL (male/unsexed)
Environment:  reef-associated; marine; depth range 0 - 20 m
Distribution:  Indo-West Pacific: Oman and India east to Philippines; north to Japan, south to Australia.
Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 0-0; Anal spines: 0-0; Anal soft rays: 0-0; Vertebrae: 127-135. Color pale yellowish; dark brown spots clustering to form larger ones in about 4 irregular rows along the body. Margin of fins white in juveniles; reduced to tip of tail in adults. Vertebrae 127-135. Description: Characterized by body depth at gill opening 10-18 in TL; origin of dorsal fin anterior to gill opening; anus at about middle of body; canine teeth in single row in jaws are moderately large; usually with one median row of three intermaxillary canines; single row of 3-9 small teeth in vomer (Ref. 90102).
Biology:  Found in shallow reefs, including tidepools (Ref 90102); in turbid waters with muddy substrates (B. Haze, pers.comm., 11/2023).
IUCN Red List Status: Least Concern (LC); Date assessed: 18 August 2011 Ref. (130435)
Threat to humans:  harmless
Country info:  Photographed from Dauin-Apo I. and observed at 10-15 m below a large rock on an otherwise mud/muck habitat (Ref. 127519). It was reported to be common in the country, usually found in more turbid waters in shallow reefs with muddy substrates and was discovered that it could hybridize with G. reevesii (so sometimes intermediate coloration pattern exists) which is relatively rare in the Philippines (Dr. Wen-Chien Huang, pers.comm. with Bart Hazes 11/2023). Also Ref. 2334, 90102.


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