The genera of the Neotropical armored catfish subfamily Loricariinae (Siluriformes: Loricariidae): a practical key and synopsis. Author Raphael Covain Author Sonia Fisch-Muller text Zootaxa 2007 1462 1 40 http://www.zoobank.org/urn:lsid:zoobank.org:pub:D1F13841-BD7B-4D00-B57D-9CBEC187B83C journal article z01462p001 D1F13841-BD7B-4D00-B57D-9CBEC187B83C Pseudohemiodon Bleeker, 1862 . Type species: Hemiodon platycephalus Kner, 1853 . Holotype : lost ( Isbruecker 1971), Brazil , Rio Cuiaba . Gender: masculine. Pseudohemiodon is distributed in the Amazon and Parana River basins. This genus is also known from the Orinoco system. Like other members of the Pseudohemiodon group, Pseudohemiodon occurs primarily over sandy substrates. This ecological specialization is reflected by the dramatic dorsoventral compression of the body and pelvic fins that are used mainly for locomotion on sand. Sexual dimorphism is unknown, but like the other genera in this group, Pseudohemiodon species are abdomino-lip brooders (pers. obs.). The very large eggs are incubated by the male. Considering their ecological and morphological specialization, representatives of the Pseudohemiodon group may represent highly derived Loricariinae . This is in agreement with Rapp Py-Daniel (1997), who found Planiloricariina nested within Loricariini , as sister group of Loricaria . Seven species are currently recognized (Ferraris 2003). A partial key to the species is available in Isbruecker (1975).