Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Classis: Chondrichthyes
Subclassis: Elasmobranchii
Infraclassis: Euselachii
Division/Cohort: Neoselachii
Subdivision/Subcohort: Batoidea
Superordo: Batomorphii
Ordo: Myliobatiformes
Subordo: Myliobatoidei
Superfamilia: Dasyatoidea
Familia: Potamotrygonidae
Genus: Heliotrygon
Species (2): H. gomesi – H. rosai
Name
Heliotrygon M. R. de Carvalho & Lovejoy, 2011
Gender: feminine
Type species: Heliotrygon gomesi De Carvalho & Lovejoy, 2011
Fixation: original designation [p. 18]
References
De Carvalho, M.R.; Lovejoy, N.R. 2011: Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae). Zootaxa, 2776: 13–48. Preview
Heliotrygon is a genus of freshwater stingrays in the family Potamotrygonidae. The genus is endemic to the Amazon basin in South America. Despite being discovered decades earlier, the genus was only scientifically described in 2011.[1] They mainly live in deep river channels, but approach the shore at night to feed on fish.[2]
Their discs are very circular in shape (including the snout), and they have tiny eyes and a relatively short tail with an essentially harmless, vestigial stinger (sometimes even lacking).[2][3] The largest confirmed disc width is 80 cm (2.6 ft),[4] but there are reports of individuals where it was 1 m (3.3 ft).[2] Both species are greyish or brownish above, but while H. gomesi is overall plain without distinct markings, H. rosai has a white to creamy-white vermiculated pattern.[1]
Species
Heliotrygon gomesi M. R. de Carvalho & Lovejoy, 2011 (Gomes's round ray)
Heliotrygon rosai M. R. de Carvalho & Lovejoy, 2011 (Rosa's round ray)
References
de Carvalho, M.R. and N.R. Lovejoy (2011). Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae). Zootaxa 2776: 13-48.
Wheeler, Quentin (10 April 2011). "New to Nature No 37: Heliotrygon stingrays". The Guardian. Retrieved 25 October 2017.
Last; White; de Carvalho; Séret; Stehmann; Naylor, eds. (2016). Rays of the World. CSIRO. pp. 620–623. ISBN 9780643109148.
Froese, Rainer and Pauly, Daniel, eds. (2017). Species of Heliotrygon in FishBase. October 2017 version.
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