F am i 1 y RHYACICHTHYID AE 
Body partly cylindrical anteriorly, laterally compressed posteriorly, 
with caudal peduncle moderately long. Head rather short, broadly expanded, 
and with wide set paired fins lower surfaces flattened, functioning to 
hold fish like a disk to rocks or other firm objects. Snout long. 
iiyes 
high, face upward. Mouth small, inferior. Teeth small. Gill openings 
4 
moderate. No air bladder. Scales moderate or large, ctenoid. Head 
largely scaleless. Fins scaleless, except caudal base. Two distinct 
dorsals, well separated. Caudal moderate or large. Pectorals large, wide 
set, ventrals smaller and closer. 
A small group of aberrant gobies, apparently comprising.a single 
genus "which so closely resembles in its adaptive features Chimarrichthys , 
Homaloptera and Exostoma, belongs to the Gobiidae", according to Boulenger. 
/ 
Koumans Hives the family name as Rhiachthyidae. 
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Prelim. Rev. Genera Gobioid Wishes, p. 14, 1931* 
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