The genera of the Neotropical armored catfish subfamily Loricariinae (Siluriformes: Loricariidae): a practical key and synopsis. Raphael Covain Sonia Fisch-Muller Zootaxa 2007 1462 1 40 728F 281770 urn:lsid:zoobank.org:act:E805457A-B6F3-4756-950E-1AD4B96002BB Actinopterygii Loricariidae Pseudohemiodon Animalia Pseudohemiodon Bleeker 1862:3 Siluriformes 34 Chordata genus   Pseudohemiodonis distributed in the Amazon and ParanaRiver basins. This genus is also known from the Orinoco system. Like other members of the Pseudohemiodongroup, Pseudohemiodonoccurs 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, Pseudohemiodonspecies are abdomino-lip brooders (pers. obs.). The very large eggs are incubated by the male. Considering their ecological and morphological specialization, representatives of the Pseudohemiodongroup may represent highly derived Loricariinae. This is in agreement with Rapp Py-Daniel (1997), who found Planiloricariinanested 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). 923893107 Brazil Rio Cuiaba Holotype