Potamotrygon amazona

FONTENELLE & DE CARVALHO, 2017



Classification: Elasmobranchii Rajiformes Potamotrygonidae

Reference of the original description
FONTENELLE, J.P. & DE CARVALHO, M.R. (2017)
Systematic revision of the Potamotrygon scobina Garman, 1913 species-complex (Chondrichthyes: Myliobatiformes: Potamotrygonidae), with the description of three new freshwater stingray species from Brazil and comments on their distribution and biogeography. Zootaxa, 4310 (1): 1–63

Types
Potamotrygon amazona
Holotype: MZUSP: 117344; Paratype: MZUSP: 117346; MZUSP: 117348;

Images of types

Description :


Citation: Potamotrygon amazona FONTENELLE & DE CARVALHO, 2017: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 07/2019

Please send your images of "Potamotrygon amazona" to info@shark-references.com

Potamotrygon amazona FONTENELLE & DE CARVALHO, 2017; holotype, MZUSP 117344, adult male, 532 mm DW, rio Jutaí, upper rio Amazonas basin, state of Amazonas, Brazil © João Pedro Fontenelle
Common names
eng Amazons freshwater stingray

Short Description
Original diagnose after FONTENELLE & DE CARVALHO, 2017 [25646]: Potamotrygon amazona sp. nov. is distinguished from congeners, except P. limai, P. scobina, P. garmani sp. nov., and P. adamastor sp. nov., by a combination of characters: disc relatively thick and robust, with a dark brownish to gray dorsal color, covered with numerous whitish to beige irregular spots, with small ocelli sometimes present; disc completely covered by denticles, with a high concentration of denticles on rostral portion of disc; rostral denticles simple, with a single central crown, and star-shaped basal plate; head denticles present star-shaped crowns, with a well-developed anterior dichotomy and small lateral dichotomies; caudal denticles with a central coronal plate and two anterior dichotomies, and a star-shaped basal plate; three angular cartilages of different sizes between jaw and hyomandibula; two to three irregular rows of thorns on dorsal tail midline, varying in size; tail long and robust, very prickly; tail base wide; cartilaginous rod relatively short. Potamotrygon amazona sp. nov. is further separated from P. limai by not having any polygonal pattern over disc, by having a wider tail (16.7% DW vs. 14.8% in P. limai), and by having simpler dermal denticles (smaller number and size of coronal ridges). From P. scobina and P. garmani sp. nov., P. amazona sp. nov. is distinguished by having a considerably more muscular disc, a more intense concentration of denticles on disc, dorsal color with many more spots, and a wider and shorter tail (mean tail width 14.9% DW vs. 13.4% DW in P. scobina and 14.1% DW in P. garmani sp. nov.; mean tail length 86.1% DW vs. 121.5% DW in P. scobina and 100.6% DW in P. garmani sp. nov.). Finally, P. amazona sp. nov. is separated from P. adamastor by having more dermal denticles on disc, greater number of dorsal spots forming clusters, and a longer tail (mean tail length 86.1% DW vs. 78.1% DW in P. adamastor).

Distribution
Rio Jutaí basin, Brazil, Rio Branco (Roraima state) and Rio Juruá [25646]

Size / Weight / Age
405–584 mm DW [25646]

Habitat
freshwater [25646]

Dentition
Teeth small and numerous, wider than long, set in quincunx in a narrow arched upper tooth plate and a wide and trapezoidal lower tooth plate. Tooth rows varying from 52–56 in upper jaw and 48–58 in lower jaw in males; single female specimen counted with 44 teeth in both jaws. Adult males present a single central pointed cusp on teeth in center of tooth plate. Lateral teeth in adult males, juvenile male examined, and female simple, presenting a single rounded cusp. [25646]

Remarks
shark-references Species-ID=14932;