Potamotrygon tigrina, a new species of freshwater stingray from the upper Amazon basin, closely related to Potamotrygon schroederi Fernandez-Yépez, 1958 (Chondrichthyes: Potamotrygonidae)

  • MARCELO R. DE CARVALHO, MARK H. SABAJ PEREZ & NATHAN R. LOVEJOY


    Abstract


    A new species of Neotropical freshwater stingray, family Potamotrygonidae, is described from the Río Nanay in the upper Río Amazonas basin of Peru. Potamotrygon tigrina, n. sp., is easily distinguished from all congeners by its conspicuous dorsal disc coloration, composed of bright yellow to orange vermiculations strongly interwoven with a dark-brown to deep-black background. Additional features that in combination diagnose P. tigrina, n. sp., include the presence of a single angular cartilage, low and not closely grouped dorsal tail spines, and coloration of tail composed of relatively wide and alternating bands of creamy white and dark brown to black. Potamotrygon tigrina is closely related to Potamotrygon schroederi Fernandez-Yépez, 1958, which occurs in the Rio Negro (Brazil) and Río Orinoco (Venezuela, Colombia). Both species are very similar in proportions and counts, and share features hypothesized to be derived within Potamotrygonidae, related to their specific angular cartilage morphology, distal tail color, dorsal tail-spine pattern, and ventral lateral-line system. To further substantiate the description of P. tigrina, n. sp., we provide a redescription of P. schroederi based on material from the Rio Negro (Brazil) and Río Orinoco (Venezuela). Specimens from the two basins differ in number of vertebral centra and slightly in size and frequency of rosettes on dorsal disc, distinctions that presently do not warrant their specific separation. Potamotrygon tigrina is frequently commercialized in the international aquarium trade but virtually nothing is known of its biology or conservation status.
    Quelle: Zootaxa 2827: 1–30 (2011)


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    Viele Grüße
    Elko

  • Moin,


    ... nein, ich habe da kein Bild.


    Stockliste - ich weiß ja nicht wie das bei den Rochen ist,
    aber analog zu den Welsen könnte der ja auch unter einer anderen, nicht unbedingt wissenschaftlichen Bezeichnung auf einer Stockliste gelandet sein.
    Unsere Rochenfreaks kennen sich da sicherlich besser aus.


    Ein paar Infos findet man auch schon im Netz. Da ich die inhaltlich nicht bewerten kann, möchte diese hier nicht verlinken.
    Aber Google hilft. ;)


    Viele Grüße
    Elko