Jacques Géry followed Böhlke's lead in a paper from 1972. However, "trutta dentata" is simply Latin for "toothed trout", which is one of the most general labels that researchers give to fish. (The opposite is "trutta edentula", which means "toothless trout".)This is further evidenced in the fact that "trutta dentata" as a phrase appears as far back as 1740. Furthermore, the genus Trutta (now obsolete, synonymized with Salmo) was not available as a classification until 1764, upon proposition by French zoologist François Alexandre Pierre de Garsault. Habitat and ecology Like all members of Iguanodectidae, members of Piabucus reside solely in South America. They are found in freshwater environments, though they are known to tolerate brackish water as well, venturing into estuaries. Piabucus is known from the Mamoré, Paraguay, and Madeira rivers, as well as the lower Amazon river basin. In the Paraguay river, it is only represented by P. melanostoma, which is also the only species from the subfamily Iguanodectinae to reside therein. P. dentatus is the only species to reside in Guyana. P. dentatus was also mistakenly listed as appearing in Peru by Eigenmann in 1910, but this is not the case. Members of Piabucus, while all inhabiting freshwater, prefer varying environments. At least one species, P. caudomaculatus, is known to occur in blackwater habitats. P. dentatus is found in muddy, unclear waters. P. melanostoma lives in an area subject to regular flooding and takes advantage of bodies of still water left behind, feeding on plants, algae, and small invertebrates that are swept in. P. dentatus and P. caudomaculatus are more insectivorous than omnivorous. Conservation status Piabucus, while taken from the wild for the ornamental fish trade, is not being collected at a high enough rate to warrant concern for the genus. P. caudomaculatus and P. dentatus have both been assessed by the IUCN as species of least concern; reports from hobbyists show that collection of P. dentatus is ongoing. P. melanostoma, while not assessed, is assumed to have a stable population due to its wide range, despite dispersion abilities limited by a flood-cycle wetland habitat. References Fish of South America Taxa named by Lorenz Oken Freshwater fish genera