| 词条 | Bigtooth river stingray |
| 释义 |
| name = Bigtooth river stingray | image = Potamotrygon national aquarium.jpg | image2 = Potamotrygon pittsburgh.jpg | image2_caption = Showing upperparts (photo above) and underparts with mouth (photo below) | status = LC | status_system = IUCN3.1 | status_ref = [1] | regnum = Animalia | phylum = Chordata | classis = Chondrichthyes | ordo = Myliobatiformes | familia = Potamotrygonidae | genus = Potamotrygon | species = P. henlei | binomial = Potamotrygon henlei | binomial_authority = (Castelnau, 1855) | synonyms = Trygon henlei Castelnau, 1855 }} The bigtooth river stingray or Tocantins River ray (Potamotrygon henlei) is a species of freshwater fish in the family Potamotrygonidae.[2] It is endemic to the lower Tocantins basin and Araguaia basin in Brazil,[3] and prefers muddy bottoms.[1] It is sometimes kept in aquaria.[1] This stingray is generally common and its population increased after the Tucuruí Dam was completed, unlike many other species in its range.[1] Appearance and relativesP. henlei reaches up to {{convert|71|cm|ft|abbr=on}} in disc width and {{convert|104.2|cm|ft|abbr=on}} in total length.[1] It is replaced by the closely related P. rex in the mid and upper Tocantins basin, but that species has concentrically clustered yellow-orange spots.[3] Two other close relatives where the spots are yellowish-white (as in P. henlei) are found in other Brazilian rivers: P. leopoldi from the Xingu River basin and P. albimaculata from the Tapajós River basin.[4] Compared to P. leopoldi, P. henlei is duller above, appearing blackish or dark gray-brown (as opposed to deeper black in P. leopoldi), and its underparts have a large white center and broad brownish-dusky edges (underparts mostly brownish-dusky in P. leopoldi).[4][5] Compared to P. albimaculata, P. henlei has larger yellowish-white spots above.[4][5]References1. ^1 2 3 4 {{Cite journal | author = Rincon, G. (SSG South America Regional Workshop, June 2003) | title = Potamotrygon henlei | journal = The IUCN Red List of Threatened Species | volume = 2004 | page = e.T39402A10225965 | publisher = IUCN | date = 2004 | url = http://www.iucnredlist.org/details/39402/0 | doi = 10.2305/IUCN.UK.2004.RLTS.T39402A10225965.en | access-date = 11 January 2018}} 2. ^{{FishBase |genus=Potamotrygon |species=henlei |year=2017 |month=February}} 3. ^1 Carvalho, M.R.d. (2016): Potamotrygon rex, a new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the middle and upper rio Tocantins, Brazil, closely allied to Potamotrygon henlei (Castelnau, 1855). Zootaxa, 4150 (5): 537–565. 4. ^1 2 Carvalho, M.R.d. (2016): Description of two extraordinary new species of freshwater stingrays of the genus Potamotrygon endemic to the rio Tapajós basin, Brazil (Chondrichthyes: Potamotrygonidae), with notes on other Tapajós stingrays. Zootaxa, 4167 (1): 1–63. 5. ^1 {{cite| author=Ramos, H.A.C. | date=May 2017 | title=Commercial species of freshwater stingrays in Brazil | publisher=Department of Sustainable Use of Biodiversity and Forests, Brazilian Institute of Environment and Renewable Natural Resources and Ministry of the Environment | pages=1-33 }} External links{{Commons category|Potamotrygon henlei}}
5 : Potamotrygon|Endemic fauna of Brazil|Freshwater fish of Brazil|Fish described in 1855|Taxonomy articles created by Polbot |
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