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Issue: Vol. 492 No. 1: 21 Apr. 2004
Type: Article
Published: 2004-04-21
DOI: 10.11646/zootaxa.492.1.1
Page range: 1–12
Abstract views: 44
PDF downloaded: 4

A new species of whiptail stingray of the genus Dasyatis Rafinesque, 1810 from the Southwestern Atlantic Ocean (Chondrichthyes: Myliobatiformes: Dasyatidae)

Ph.D. student, Museu Nacional/ Universidade Federal do Rio de Janeiro, Departamento de Vertebrados- Setor de Ictiologia Universidade do Estado do Rio de Janeiro, Instituto de Biologia, Departamento de Zoologia. Rua São Francisco Xavier 542, CEP. 20559-900, Rio de Janeiro, RJ. Brazil
Universidade do Estado do Rio de Janeiro, Instituto de Biologia, Departamento de Zoologia. Rua São Francisco Xavier 542, CEP. 20559-900, Rio de Janeiro, RJ. Brazil Research supported by PROCIÊNCIA/UERJ/FAPERJ
Ph.D. student, Universidade Federal da Paraíba, Departamento de Sistemática e Ecologia, CCEN, 58059-900, João Pessoa, PB, Brazil
Pisces Dasyatis colarensis new species Dasyatidae North of Brazil

Abstract

The new species is compared both with other Dasyatis species of the southwestern Atlantic and with similarly shaped species of Dasyatis from other areas of the world. The holotype was collected in Maraj Bay; near Colares Island, district of Colares, Bel m, Par State, Brazil. It differs from known Dasyatis species by the combination of the following characters: a diamond-shaped (rhomboid) disc; an elongate snout (preorbital distance ranges from 35.7 to 37.7 % in disc width); a dark, well defined band or dark blotches outlining the lower lips; a row of small tubercles along midline of disc from shoulder region to base of tail, presenting a widespread and random arrangement; posterior margins of pectoral fins uniformly rounded; triangular-shaped pelvic fins with posterior margin almost straight or slightly sinuous and tips exceeding the limits of the posterior margin of disc; dorsal caudal keel absent in the holotype, but vestigial in both paratypes.

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