Killi
   
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Biotoecus
Biotoecus

Breeze, M. (2006). Biotoecus opercularis: when opportunity arises. Cichlidae 27 (4): 3-10.

Roemer, U. (2004). Notes on Biotoecus opercularis (Steindachner, 1903). Cichlidae : 3-12.

Schleser, D. M. (1993). Ein Juwel vom Rio Negro - Biotoecus opercularis. Die Aquarien- und Terrarien-Zeitschrift (DATZ) 46 (12): 760-762.

Kullander, S. O. (1989). Biotoecus Eigenmann and Kennedy (Teleostei, Cichlidae) - description of a new species from the Orinoco basin and revised generic diagnosis. Journal of Natural History 23 (1): 225-260.

Mayland, H. (1987). Endlich wiederentdeckt. Biotoecus opercularis (Steindachner, 1875). Das Aquarium : 400-402.

Regan, C. T. (1906). A revision of the South American cichlid genera Retroculus, Geophagus, Heterogramma and Biotoecus. Annals & Magazine of Natural History 17 : 49-66).







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