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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

O gênero Squalus no Brasil : caracterização do grupo megalops e determinação do status taxonômico das formas brasileiras / The genus Squalus in Brazil : characterization of the megalops group and determination of the taxonomic status of the Brazilian forms

Marques, Alessandra Resende 21 May 1999 (has links)
Submitted by Alberto Vieira (martins_vieira@ibest.com.br) on 2018-01-31T00:29:49Z No. of bitstreams: 1 569925.pdf: 15086841 bytes, checksum: 89e5e3ae8d68f6aded9ed24d43c96b31 (MD5) / Made available in DSpace on 2018-01-31T00:29:49Z (GMT). No. of bitstreams: 1 569925.pdf: 15086841 bytes, checksum: 89e5e3ae8d68f6aded9ed24d43c96b31 (MD5) Previous issue date: 1999-05-21 / No presente estudo são definidos três grupos de espécies de Squalus para o litoral brasileiro, e é feita uma caracterização do grupo megalops. A partir da análise da morfologia externa (formato das nadadeiras pélvicas, comprimento do espinho das nadadeiras dorsais em relação a altura das nadadeiras e posição das nadadeiras pélvicas em relação as nadadeiras dorsais), dentículos dérmicos, condrocrânio, coluna vertebral, dentição e mixopterígios, verifica-se que o Squalus megalops do sul do Brasil (sensu Vooren, 1992), o Squalus cubensis do sudeste do Brasil (sensu Figueiredo, 1977) e Squalus sp. do sudeste (sensu Figueiredo, 1981) constituem uma única espécie, que foi denominada Squalus sp. do grupo megalops. Os caracteres que se mostraram mais importantes para a definição da espécie foram: morfologia externa, dentículos dérmicos, condrocrânio e mixopterígios. O estudo indica ainda que outras duas formas ocorrem na costa brasileira: Squalus acanthias e Squalus sp. do grupo blainvillei. / Three species groups of Squalus from the Brazilian coast are defined and the megalops group is characterized. According to analysis of external morphology (pectoral fins shape, dorsal fins spines length in comparison with the high of these fins and position of pelvic fins in comparison with dorsal fins), dermal denticles, chondrocranium, vertebral column, dentition and claspers, it is demonstrated that southern species Squalus megalops (sensu Vooren, 1992), southeastern Squalus cubensis (sensu Figueiredo, 1977) and Squalus sp. (sensu Figueiredo, 1981 ), from central and southern Brazil, represents a single species, wherein Squalus sp. of the megalops group. The most important characters to define this species were external morphology, dermal denticles, chondrocranium and claspers. The study also indicated two aditional species occurs in Brazilian waters: Squalus acanthias and Squalus sp. of the blainvillei group.

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