Comprehensive Description

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Pseudohemiodon Bleeker, 1862 ZBK .

Type species: Hemiodon platycephalus Kner, 1853 ZBK .

Holotype : lost ( Isbrücker 1971), Brazil , Rio Cuiaba .

Gender: masculine.

Pseudohemiodon ZBK is distributed in the Amazon and Paraná River basins. This genus is also known from the Orinoco system. Like other members of the Pseudohemiodon ZBK group, Pseudohemiodon ZBK 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 ZBK 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 ZBK 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 ZBK . Seven species are currently recognized (Ferraris 2003). A partial key to the species is available in Isbrücker (1975).


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