Cataetyx alleniCataetyx alleni, sometimes called Allen's brotula, is a species of fish in the family Bythitidae.DescriptionCataetyx alleni is grey, with a maximum length of. It has 109–111 dorsal finrays, 79–83 anal finrays, and 31–32 pectoral finrays.HabitatCataetyx alleni is bathydemersal, living at depths of in the Atlantic Ocean and Mediterranean Sea.BehaviourCataetyx alleni reproduces viviparously. It feeds on polychaetes and benthic crustaceans.