Resurrection and Redescription of the Southern Dogfish Squalus probatovi (Squalidae), a Valid Species from Angola

Abstract

Squalus probatovi, a medium size dogfish species originally from Angolan waters, is resurrected as a valid species and redescribed herein based on morphological characters. This species has been misidentified with S. megalops, S. acutipinnis and S. blainvillei due to confused and concise original description and lack of comparative scrutiny with congeners on later taxonomic accounts. Squalus probatovi is sympatric with S. acanthias, S. blainvillei, S. acutipinnis, S. lalannei, S. mahia, S. margaretsmithae, and S. bassi in the Eastern Atlantic and Western Indian Oceans. The Southern dogfish is characterized by having body bluish dark grey, head small, dorsal-fin spines short, pectoral fins narrow with free rear tips rounded, and caudal fin with narrow lobes and pointed caudal tips, snout moderately short with prenarial length slightly greater than inner nostril-labial furrow space, dermal denticles tricuspid and rhomboid, and high number of total vertebrae (118–124). It differs from its regional congeners by having origin of first dorsal fin located over vertical traced at origin of pectoral fins (vs. posterior to origin of pectoral fins), and dorsal fins upright and slender at fin web (vs. prone and broad at fin web, except for S. mahia). The taxonomic status of S. probatovi and morphological comparisons with regional and other similar species are discussed. An identification key to species of Squalus that occurs in African waters is also provided.

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ACKNOWLEDGMENTS

We are sincerely grateful to E. Vasil’eva (ZMMU) for taking measurements and pictures of the holotype, and to A. Orlov (VNIRO) for sending copies of Russian literature. G. Duhamel, P. Pruvost and staff (MNHN), O. Crimmen, R. Britz and J. Maclaine (NHM), O. Gon, R. Bills, A. Whitfield and staff (SAIAB), D. Clark and M. Bougaardt (SAM), R. Thiel (ZMH), U. L. Gomes and H. Ricardo (UERJ), M. Britto and late G. Nunan (MNRJ), E. Matos and P. Lenktaitis (USP), M. McGrouther and J. Paxton (AMS), P. R. Last, A. Graham and J. Pogonoski (CSIRO) are thanked for curatorial and technical support. Special thanks to M.T.P. Ragazzo (USP) for academic support, R. Thiel and I. Eidus (ZMH) for sending film radiographs, and W. White (CSIRO) for sharing photos of comparative type material. The first author was supported by the Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP, 2011/18861-7, 2013/11621-6, 2014/26503-1), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, 158773/2011-0), and Geddes Collection Visiting Fellowship, Australian Museum (2013). The second author was supported by a grant from CNPq (305271/2015-6).

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Viana, S.T., de Carvalho, M.R. Resurrection and Redescription of the Southern Dogfish Squalus probatovi (Squalidae), a Valid Species from Angola. J. Ichthyol. 58, 617–632 (2018). https://doi.org/10.1134/S003294521805020X

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Keywords:

  • redescription
  • resurrection
  • identification key
  • taxonomy
  • morphology
  • Eastern Atlantic and Western Indian Oceans
  • southern dogfish, Squalus