Paratrygon parvaspina

Loboda, Lasso, Rosa & De Carvalho, 2021



Classification: Elasmobranchii Myliobatiformes Potamotrygonidae

Reference of the original description
Loboda, T.S. & Lasso, C.A. & Rosa, R.S & de Carvalho, M.R. (2021)
Two new species of freshwater stingrays of the genus Paratrygon (Chondrichthyes: Potamotrygonidae) from the Orinoco basin, with comments on the taxonomy of Paratrygon aiereba. Neotropical Ichthyology, 19(2), Article e200083

Types
Paratrygon parvaspina
Holotype: IAvH: P 12447; Paratype: IAvH: P 12441; IAvH: P 12446; MZUSP: 117836;

Images of types

Description :


Citation: Paratrygon parvaspina Loboda, Lasso, Rosa & De Carvalho, 2021: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 05/2022

Please send your images of "Paratrygon parvaspina" to info@shark-references.com

Paratrygon parvaspina LOBODA, LASSO, ROSA & DE CARVALHO, 2021, Holotype, IAvH-P 12447, adult female, 450 mm DW, from Bita river; Paratype, IAvH-P 12441, juvenile female, 255 mm DW, from Tomo river. A., C. dorsal and B., D. ventral views © LOBODA, LASSO, ROSA & DE CARVALHO, 2021
Short Description
Original diagnosis of LOBODA, LASSO, ROSA & DE CARVALHO, 2021 [29758]: A species of Paratrygon diagnosed by the following combination of characters. Spiracular process extremely short and reduced, slightly more developed in adults, and with few dermal denticles (vs. P. aiereba with large and knob shaped spiracular processes that almost cover the spiracle aperture, and P. orinocensis with short and straight spiracular process with developed dermal denticles). Caudal sting very reduced, with mean of its length 6.2% DW [5.6‒7.1% DW] (vs. longer caudal stings in P. aiereba and P. orinocensis with means and ranges, respectively, 11.3% DW [3‒17.9% DW], and 11.9% DW [6.7‒15.3% DW]). Tail short, with means of the pre-caudal sting region and the distance between cloaca and tail tip, respectively, 21.1% and 50.4% DW (vs. longer tails in P. aiereba and P. orinocensis, with means of the pre-caudal sting region and the distance between cloaca and tail tip, respectively, 23.5% and 87.8% DW in P. aiereba, and 25.2% and 115.4% DW in P. orinocensis). Anterior disc margin broadly rounded (vs. P. aiereba and P. orinocensis with well developed and visible concave anterior disc margins, especially the latter). Spiracles small and quadrangular, with mean length 5.2% DW [4.9‒5.8% DW] (vs. larger spiracles in P. aiereba, with mean length 6% DW [4.4‒11.6% DW], and P. orinocensis with triangular and slightly smaller spiracles, with mean spiracle length 5.6% DW [4.5‒7.9% DW]). Rostral projection relatively large (vs. small or minute in P. aiereba and P. orinocensis, respectively). Preorbital processes more laterally projected, externally exceeding level of nasal capsules (vs. preorbital processes less laterally projected, not exceeding level of nasal capsules in P. aiereba and P. orinocensis). Lateral stay of synarcual cartilage long, exceeding the lateral level of anterior ventral condyle (vs. short in P. aiereba and P. orinocensis not exceeding the lateral level of anterior ventral condyle). Dorsolateral crest of scapular process not pronounced and not exceeding laterally the level of mesocondyle (vs. pronounced dorsolateral crests that laterally exceed the level of mesocondyle in P. aiereba and P. orinocensis). Propterygium robust (vs. more slender in P. aiereba and P. orinocensis). Concavity of the internal face of mesopterygium not so pronounced and curved (vs. very pronounced and curved in P. aiereba and P. orinocensis). Metapterygium robust and highly curved (vs. metapterygium slender and more straight in P. aiereba and P. orinocensis).

Distribution
Endemic to the Orinoco basin, [29758]

Size / Weight / Age
TL (max): 543 mm [29758]

Habitat
freshwater [29758]

Dentition
Teeth triangular, cuspidate, arranged in quincunx in both jaws, and without size difference between teeth from lateral and central rows; teeth of central rows with more developed cusps than laterals, however cusps more similar in height with P. aiereba’s teeth and minor than P. orinocensis ones. Tooth rows of holotype (IAvH-P 12447, adult female) 31/22.[29758]

Remarks
shark-references Species-ID=16138;