Potamotrygon wallacei

DE CARVALHO, ROSA & DE ARAÚJO, 2016



Classification: Elasmobranchii Rajiformes Potamotrygonidae

Reference of the original description
DE CARVALHO, M.R. & ROSA, R.S. & DE ARAÚJO, M.L.G. (2016)
A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon. Zootaxa, 4107 (4): 566–586



Description :


Citation: Potamotrygon wallacei DE CARVALHO, ROSA & DE ARAÚJO, 2016: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 02/2019

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Common names
raia cururu

Short Description
Original Diagnosis after DE CARVALHO, ROSA & DE ARAÚJO, 2016 [24103]: A species of Potamotrygon endemic to the Rio Negro drainage, diagnosed by its unique color pattern, composed of a light brown dorsal disc surface with blackish irregularly-shaped, few and broad vermiculations on central disc, delimiting a light brown amphora- or Ω-shaped figure or large light brown reniform blotches at disc center, with subcircular to reniform ocellated light brown spots towards disc margins, a dark-banded tail on its sides, and small size (smallest known species of Potamotrygon, maturing at 160–190 mm DW, largest examined specimen 310 mm DW). The following combination of characters further distinguishes this species from congeners: enlarged spines on dorsal midtail in one to three irregular rows, few in number, low, and not extending posteriorly to caudal stings, ending near mid length of tail; denticles on posterior mid-disc and tail base Y-shaped, with a central, anterior, bulbous cusp and usually two posterior pairs of smaller, rounded cusps; anterior angular cartilage well-developed, lacking posterior angular cartilage (both angulars present and well developed in most species of Potamotrygon, except P. tigrina, P. schroederi, P. histrix, P. schuhmacheri, P. orbignyi, P. humerosa, P. signata, and P. marinae; P. wallacei, n. sp., is easily distinguished from these species by its unique color pattern, arrangement of enlarged spines on dorsal tail, and smaller size); and clasper skeleton with a single basal segment (almost all species of potamotrygonids have two segments).

Distribution
endemic to the Rio Negro drainage in Amazonas, Brazil, occurring from Santa Isabel down to Rio Cuieiras in the vicinity of Manaus [24103]

Size / Weight / Age
DW: 72.4–263mm [24103]

Habitat
freshwater [24103]

Remarks
shark-references Species-ID=14571;

Parasites (arranged by Jürgen Pollerspöck)
Conoidasida