''Plesiotrygon'', the antenna rays, is a small

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of freshwater

stingray Stingrays are a group of sea rays, which are cartilaginous fish related to sharks. They are classified in the suborder Myliobatoidei of the order Myliobatiformes and consist of eight families: Hexatrygonidae (sixgill stingray), Plesiobatidae ( ...

s in the family

Potamotrygonidae River stingrays or freshwater stingrays are Neotropical freshwater fishes of the family (biology), family Potamotrygonidae in the Order (biology), order Myliobatiformes, one of the four orders of Batoidea, batoids, cartilaginous fishes related to ...

endemic to the

Amazon basin The Amazon basin is the part of South America drained by the Amazon River and its tributaries. The Amazon drainage basin covers an area of about , or about 35.5 percent of the South American continent. It is located in the countries of Bolivi ...

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the southe ...

.De Carvalho, M.R. and M.P. Ragno (2011)
An unusual, dwarf species of Neotropical freshwater stingray, Plesiotrygon nana sp. nov., from the upper and mid Amazon basin: the second species of Plesiotrygon (Chondrichthyes: Potamotrygonidae).
Papéis Avulsos de Zoologia 51(7): 101-138. They are found in large rivers and the lower part of their tributaries. The maximum disc width is up to , but both species are very long-tailed (tail length typically at least twice the disc width). ''Plesiotrygon'' are occasionally kept in aquariums and both species have been bred in captivity, but they are sensitive and the tail is easily damaged.

Species

There are two recognized species: * '' Plesiotrygon iwamae'' R. de S. Rosa, Castello & Thorson, 1987 (Long-tailed river stingray, antenna ray) * '' Plesiotrygon nana'' M. R. de Carvalho & Ragno, 2011 (Black-tailed antenna ray, dwarf antenna ray)

References

Potamotrygonidae Ray genera Freshwater fish genera {{rajiformes-stub