of Marine and Nonmarine Genera consider it synonymous with Iguanodectidae, where Eschmeyer's Catalog of Fishes and GBIF simply don't acknowledge it, uniting all three genera in Iguanodectidae. However, sources such as OBIS and the World Register of Marine Species consider it valid. Habitat Like all members of the family Iguanodectidae, members of Iguanodectes solely inhabit freshwater environments in South America. Iguanodectes specifically can be found in the Amazon river and all of its major tributaries, as well as the Guaporé, Trombetas, Orinoco, and Tocantins rivers. Though their ecology has not been studied extensively, captive specimens demonstrate a poor tolerance for adverse water conditions. They also prefer flowing water, and have a proclivity for swimming near the surface. Some species, like I. geisleri, are known to live in blackwater environments. References Fish of South America Characiformes Taxa named by Edward Drinker Cope Taxa described in 1872