A phylogenetic study of the neotropical catfish family Cetopsidae (Osteichthyes, Ostariophysi, Siluriformes), with a new classification Author De Pinna, Mário C. C. Author Ferraris, Carl J. Author Vari, Richard P. text Zoological Journal of the Linnean Society 2007 2007-08-31 150 4 755 813 https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00306.x journal article 10.1111/j.1096-3642.2007.00306.x 0024-4082 5122EB63-C0A1-446B-A285-1D12A43C6E57 FAMILY CETOPSIDAE BLEEKER, 1858 Diagnosis (Br: 4, jk: 82, bs: 76): Maxilla with a single articular head (2); Anterior and medial palatine cartilages continuous (15, reversed to state 0 in C. coecutiens ); Opercle and interopercle overlapping, forming a lap suture (22); Point of attachment of interoperculo-mandibular ligament on the dorsal margin of the interopercle (23); Interopercle with reduction of its anteroposterior axis, so that it is as deep as, or slightly deeper than, long (24); Metapterygoid rectangular (25). Included subfamilies : Helogeninae , Cetopsinae .