Ichthyological Research

, Volume 51, Issue 2, pp 153–158

Rhinobatos nudidorsalis, a new species of shovelnose ray (Batoidea: Rhinobatidae) from the Mascarene Ridge, central Indian Ocean

Authors

    • Marine Research Laboratories, Commonwealth Scientific Industrial Research OrganisationCastray Esplanade
  • Leonard J.V. Compagno
    • Shark Research Center, South African MuseumIziko—Museums of Cape Town
  • Kazuhiro Nakaya
    • Laboratory of Marine Biodiversity, Graduate School of Fisheries SciencesHokkaido University
Article

DOI: 10.1007/s10228-004-0211-0

Cite this article as:
Last, P., Compagno, L. & Nakaya, K. Ichthyol Res (2004) 51: 153. doi:10.1007/s10228-004-0211-0

Abstract

A new shovelnose ray, Rhinobatos nudidorsalis, is described from the Mascarene Ridge, an inadequately surveyed chain of seamounts in the central Indian Ocean. Of the three subgroups of Rhinobatos occurring in the Indian Ocean, it most closely conforms with the subgenus Rhinobatos (Linnaeus). A small species, known only from the holotype, it is unique within the family in having an almost completely naked dorsal surface. In addition, it is further distinguished from other Indo-Pacific members of the genus by the combination of a pale, plain-colored disc, large eyes, the inner edge of the anterior nasal flap penetrating slightly into the internarial space, low dorsal fins, a long pelvic-fin inner margin, a narrow interdorsal space, two spiracular folds, an elongate to oval-shaped denticle patch on the caudal peduncle, and a small, weakly asymmetrical caudal fin.

Key words

Rhinobatos nudidorsalisRhinobatidaeNew speciesMascarene RidgeCentral Indian Ocean

Copyright information

© Springer-Verlag Tokyo 2004