Potamotrygon tatianae

SILVA & CARVALHO, 2011



Classification: Elasmobranchii Rajiformes Potamotrygonidae

Reference of the original description
DA SILVA, J.P.C.B. & DE CARVALHO, M.R. (2011)
A new species of Neotropical freshwater stingray of the genus Potamotrygon Garman, 1877 from the Río Madrede Díos, Peru (Chondrichthyes: Potamotrygonidae). Papéis Avulsos de Zoologia, 51 (8): 139-154

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Synonyms / new combinations and misspellings
Potamotrygon cf. tatianae

Types
Potamotrygon tatianae
Holotype: MZUSP: 107673; Paratype: MZUSP: 107667; MZUSP: 107668;


Description:


Citation: Potamotrygon tatianae SILVA & CARVALHO, 2011: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 12/2014

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Short Description
A species of Potamotrygon distinguished from congeners by the following unique combination of characters: dorsal disc with dark background, with a beige or light brown, closely packed and highly convoluted vermicular pattern; a single row of irregular spines on dorsal tail midline; and presence of star-shaped, asymmetrical and minute dermal denticles, rarely with crown dichotomies, and concentrated over central region of disc. In relation to species of Potamotrygon in the upper Río Madeira basin, P. tatianae is further distinguished from P. motoro (Müller & Henle, 1841) by lacking on disc ocelli formed by strong black concentric rings, by the more flattened aspect of its disc, by presenting much smaller dermal denticles, and considerably smaller eyes. From P. orbignyi (Castelnau, 1855), P. tatianae is further distinguished by lacking a dorsal reticulate pattern, presence of two angular cartilages, and lower number of total pectoral radials (modal values 97 vs. 90, respectively). Potamotrygon tatianae is distinguished from P. falkneri by having tail spines in one irregular row (instead of in one to three irregular rows), lower total pectoral radial count (90‑93 vs. 94‑100, respectively), by presenting a proportionally much longer tail (mean values 109% vs. 93.5% of DW, respectively), by presenting teeth with no prominent cusps in adult males (males usually with prominent cusps in P. falkneri), and by presenting spots on dorsal disc that are exclusively vermicular, not occurring as independent spots (many specimens with individual spots on background, these mostly circular, reniform, or oval, with diameter equal to or smaller than eye in P. falkneri).

Distribution
South America: Peru, Río Madre de Díos, municipal district of Boca Manu, upper Amazon basin, state of Madre de Dios.

Biology
Tropical; 12°S - 13°S, 71°W - 72°W

Size / Weight / Age
Max length : 34.8 cm WD male/unsexed; [13115]

Habitat
Demersal; freshwater