Tetronarce cowleyi, sp nov., a new species of electric ray from southern Africa (Chondrichthyes: Torpediniformes: Torpedinidae)

Autor(es)

Ebert, David A. ^{[1, 2, 3]} ; Haas, Diane L. ^{[1, 4]} ; De Carvalho, Marcelo R. ^[5]

Afiliação do(s) autor(es)

^[1] Moss Landing Marine Labs, Pacific Shark Res Ctr, Moss Landing, CA 95039 - USA

^[2] Calif Acad Sci, Dept Ichthyol, San Francisco, CA 94118 - USA

^[3] South African Inst Aquat Biodivers, ZA-6140 Grahamstown - South Africa

^[4] Calif Dept Fish & Wildlife, Sacramento, CA 95811 - USA

^[5] Univ Sao Paulo, Inst Biociencias, Dept Zool, BR-05508090 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Zootaxa; v. 3936, n. 2, p. 237-250, MAR 19 2015.
• Citações Web of Science: 2

Resumo

A new species of torpedo ray, Tetronarce cowleyi, sp. nov., is described from specimens collected from the southeastern Atlantic Ocean. The new species is placed in the genus Tetronarce based on a uniform dorsal coloration and absence of papillae around the spiracles. The new species is distinguished from its closest congeners, the North Atlantic Tetronarce nobiliana Bonnaparte, 1835, and southwestern Atlantic Tetronarce puelcha Lahille, 1926, by a combination of morphological characteristics including a shorter spiracular length, a proportionally greater head length as measured between snout margin and fifth gill openings, a proportionally greater preoral snout length, a uniform shiny black or dark gray dorsal surface, lacking any prominent markings, and a creamy white ventral color with dark edges in juveniles but fading with growth. Teteronarce cowleyi, sp. nov., is further distinguished from T. nobiliana by its more circular anterior disc shape (vs. relatively straight in T. nobiliana), fewer tooth rows (32/28 vs. 38-53/38-52 in T. nobiliana), greater mouth width (1.5-1.7 times as great as interorbital width vs. 0.5-0.6 times interorbital width in T. nobiliana), smaller distance between second dorsal and caudal fins (3.5-4.9% vs. 6.6-6.8% in T. nobiliana), and a clasper length extending nearly to lower caudal fin origin (claspers in T. nobiliana that extend only two-thirds distance between second dorsal and caudal fins). Teteronarce cowleyi, sp. nov., is known from Walvis Bay, Namibia to Algoa Bay, Eastern Cape, South Africa, at depths of 110 to 457 m. (AU)

• Processo FAPESP: 12/05391-5 - Evolução molecular de regiões regulatórias de genes HOX associados com a morfologia da nadadeira de peixes, com especial ênfase em Chondrichthyes
• Beneficiário: Marcelo Rodrigues de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/09877-0 - Estudo comparativo da morfologia do aparelho alimentar em raias da ordem Myliobatiformes (Chondrichthyes: Batoidea)
• Beneficiário: Marcelo Rodrigues de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Regular