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''Potamotrygon tatianae'' is a species of river stingray (Potamotrygonidae) native to South America; they are known only from the Río Madre de Díos, upper Río Madeira basin, Peru. ==Description== This river stingray's oval disc is longer than wide (disc length between 102 and 131% of the disc width). The total length of the described species is between 480 mm and 755 mm, the disc length is between 283 mm and 475 mm and the disc width is bewtween 265 mm and 362 mm. The mouth is small, opening relativeley straight across, and has two lateral and three central papillae. One of the central papillae is closer to the lower jaw tooth plate. The teeth are relatively small, with 36-46 rows in the upper jaw and 33‑45 in the lower jaw. The background colour is generally blackish-brown with beige, light beige, or dark brown spots. This species was named after Tatiana Raso de Moraes Possato, a late student of biology who was an enthusiastic researcher of chondrichthyans, in particular potamotrygonids. The types are housed in the Universidade de São Paulo, Museu de Zoologia, Avenida Nazaré, 481, CEP 04263-000 São Paulo, Brazil (Holotype: MZUSP 107673; Paratype: MZUSP 107667; MZUSP 107668). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Potamotrygon tatianae」の詳細全文を読む スポンサード リンク
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