Biotoecus dicentrarchus Kullander 1989

This species is distinguished from all other cichlids by having only two (vs. three or more) anal spines; differs from B. opercularis by lacking anguloarticular lateralis canal; 3 or 4 (vs. 5) skin openings and 2 or 3 (vs. 4) canal fragments representing the dentary lateralis canal; dorsal fin with slightly prolonged anterior spines and lappets; modal dorsal fin count VII.15 (vs. VIII.14); and 6 (vs. 5) dark spots along the middle of the side (Ref. 86446).

Eggs are deposited at the ceiling of a cave; the female tends to eggs and yolk-sac larvae; both parents care for the free-swimming young (Ref. 42051).

Dorsal spines (total): 7 - 8; Dorsal soft rays (total): 14 - 16; Analspines: 2; Analsoft rays: 6 - 8

The type locality was a shallow laguna about 25 m wide, with transparent water, vegetation resembling needlegrass; water temperature 34°C; associated with another cichlid species,Crenicara filamentosum, the dominant species at the locality (Ref. 86446).