Potamotrygon pantanensis

LOBODA & DE CARVALHO, 2013



Classification: Elasmobranchii Rajiformes Potamotrygonidae

Reference of the original description
LOBODA, T.S. & DE CARVALHO, M.R. (2013)
Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae). Neotropical Ichthyology, 11 (4): 693–737

Image of the original description

Potamotrygon pantanensis, n. sp. Dorsal (a) and ventral (b) views of holotype, MZUSP 110890, adult female, 323 mm DW, Cuiabá River. In: LOBODA, T.S. & DE CARVALHO, M.R. 2013: Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae). Neotropical Ichthyology, 11 (4): 693-737

Types
Potamotrygon pantanensis
Holotype: MZUSP: 110890; Paratype: MZUSP: 110888; MZUSP: 110889; MZUSP: 110894; MZUSP: 110892; MZUSP: 110891; MZUSP: 110901; MZUSP: 110874; NUP: 4179;


Description :


Citation: Potamotrygon pantanensis LOBODA & DE CARVALHO, 2013: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 11/2018

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Potamotrygon pantanesis, n. sp. Dorsal (a) and ventral (b) views of paratype, MZUSP 110891, adult male, 268 mm DW, from Cuiabá River. In: LOBODA, T.S. & DE CARVALHO, M.R. 2013: Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae). Neotropical Ichthyology, 11 (4): 693-737
Short Description
Original diagnose after LOBODA & DE CARVALHO, 2013 [20494]: Potamotrygon pantanensis, sp. nov. is distinguished from congeners from the Paraná-Paraguay basin by presenting bicolored ocelli with diameter greater or equal to eye-diameter, and vermiculated markings with a beige, yellow or orange central area surrounded by a peripheral black ring, over a uniform brown dorsal disc background color (P. falkneri, P. histrix, P. schuhmacheri, and P. brachyura lack ocelli; P. motoro and P. amandae, sp. nov. have ocelli with three and two colors, respectively, and both lack vermiculations). The following characters in combination further distinguish P. pantanensis, sp. nov. from P. motoro and P. amandae, sp. nov.: a single, clearly demarcated gray color present on anterocentral ventral disc, transversed by a gray stripe over first pair of branchial slits (lacking in both P. motoro and P. amandae, sp. nov.); presence of minute, star-shaped dermal denticles only on central disc area, and two or three rows of minute, slender and curved enlarged spines on dorsal tail (P. motoro with a single dorsal row of relatively large, tall and straight enlarged spines on dorsal tail, and P. amandae, sp. nov. with double or triple rows of small and straight spines); dorsal pseudosiphon of clasper with dorsal flap broader than in P. motoro and P. amandae, sp. nov. (in P. pantanensis, sp. nov. this flap covers an area beyond the anterior margin of dorsal pseudosiphon, whereas in P. motoro and P. amandae, sp. nov. this flap is restricted to the dorsal pseudosiphon); total pectoral radials ranging from 87 to 95 (without mode), and tooth rows of lower jaw ranging from 30 to 31 (mode 31) (P. amandae, sp. nov. with 92 to 106 pectoral radials [without mode], and 23 to 33 lower tooth rows [mode 26]); a straight frontoparietal fontanelle with parallel margins (in P. motoro frontoparietal fontanelle with slightly curved and tapering margins, and P. amandae, sp. nov. with posterior portion of frontoparietal fontanelle more rounded); anterior angular cartilage much greater than posterior angular cartilage, more than twice its length, and relatively straight anteriorly (angular cartilages subequal in P. motoro and in P. amandae, sp. nov. anterior angular cartilage curved near articulation with Meckel’s cartilage, with anterior margin very concave).

Distribution
Specimens of P. pantanensis were collected only in the northern Pantanal region, in rivers located in Barão de Melgaço, Rosário do Oeste, and Chapada dos Guimarães, all in the state of Mato Grosso (Brazil) [20494].

Size / Weight / Age
DW max: 336 mm [20494]

Habitat
Freshwater [20494]

Dentition
Teeth disposed in quincunx, very small and with same morphology in both jaws. Adult specimens without monognathic heterodonty in tooth rows (Fig. 29). Tooth rows and teeth in median rows of upper jaw, respectively, in 30 to 35 rows and 4 to 5 teeth, and in lower jaw, respectively, in 30 to 31 rows and 4 to 5 teeth [20494].

Remarks
67386