Acanthistius joanae Heemstra, 2010
Scalyjaw koester
Acanthistius joanae
photo by Heemstra, P.C.

Family:  Anthiadidae (Fairy basslets or Streamer basses)
Max. size:  14 cm SL (male/unsexed)
Environment:  pelagic-neritic; marine; depth range 23 - 140 m
Distribution:  Western Indian Ocean: South Africa.
Diagnosis:  Dorsal spines (total): 7-7; Dorsal soft rays (total): 14-16; Anal spines: 3-3; Anal soft rays: 7-7; Vertebrae: 26-26. This species is characterized by the following: distinct ctenoid scales cover the interorbital, maxilla, infraorbitals, interopercle, dorsal 4 branchiostegal rays, gular area, isthmus, chest, belly and proximal two-thirds of pectoral fin; interorbital area is slightly convex; longest dorsal fin spine equal to or longer than peduncle depth; Caudal, anal, and pelvic fins are pale (fin rays mostly reddish orange in life); a large oval, blackish brown blotch (most prominent dark mark on the head) covers most of the opercle; 17-19 pectoral-fin rays (Ref. 83528).
Biology: 
IUCN Red List Status: Data deficient (DD); Date assessed: 17 July 2017 Ref. (130435)
Threat to humans:  harmless


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