Family HETEROCOITGRIDAE 
Body very long, subcylindrical* Tail compressed, nearly twice 
or more than twice head and trunk* Snout obtuse, very short* Mouth 
cleft small, oblique, reaches front eye edge* Lower jaw protrudes * 
Tongue free# Teeth in jaws and on vomer small, acicular, in narrow 
bands, continuous with premaxillary# Front nostril very small and 
concealed, hind nostril slit near eye* Gill opening lateral narrow 
slit# Body scaleless. Lateral line present# Borsal, anal and 
caudal confluent# No pectoral# Vent far behind gill opening* 
Analysis of genera 
Pectorals absent# 
Heteroconger# 
Taenioconger* 
Pectora1s present# 
