With its
elongated body and deeply forked caudal fin, inclusion of the
specimen in Squaliforma makes no doubt, however no congeneric
specimen was ever found again in Suriname despite
the intense collecting effort. The type locality appears thus
highly doubtful, and Squaliforma tenuis should better not be
regarded as a Surinamese species. Two of the 15 Guianese
species of Hypostomus belong to the Hypostomus cochliodon
group (Armbruster, 2003), or formerly the genus Cochliodon
Kner, 1854 which was placed in synonymy of Hypostomus
by Weber and Montoya-Burgos (2002): H. taphorni (Lilyestrom,
1984) and H. macushi Armbruster and de Souza, 2005.
These species have large spoon-shaped teeth in contrast to
the viliform teeth observed in most other Hypostomus species
including H. plecostomus.