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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

Estudo Taxonômico dos Holothuroidea (Echinodermata) de águas rasas da costa Brasileira

Martins, Luciana 04 September 2013 (has links)
Submitted by Johnsson Rodrigo (r.johnsson@gmail.com) on 2013-09-02T04:04:22Z No. of bitstreams: 1 LUCIANA.pdf: 5469390 bytes, checksum: 1a7d8c5d82205a72ef52c60d6514dd14 (MD5) / Approved for entry into archive by Alda Lima da Silva(sivalda@ufba.br) on 2013-09-04T19:31:44Z (GMT) No. of bitstreams: 1 LUCIANA.pdf: 5469390 bytes, checksum: 1a7d8c5d82205a72ef52c60d6514dd14 (MD5) / Made available in DSpace on 2013-09-04T19:31:45Z (GMT). No. of bitstreams: 1 LUCIANA.pdf: 5469390 bytes, checksum: 1a7d8c5d82205a72ef52c60d6514dd14 (MD5) / CAPES / A classe Holothuroidea (Echinodermata) possui cerca de 1400 espécies válidas. No Brasil, apenas 32 espécies são registradas, correspondendo, portanto, a menos de 3% do total de espécies conhecidas. O conhecimento atual sobre o filo Echinodermata no Brasil e na Bahia foi gerado, em sua maior parte, das grandes expedições que por aqui passaram ou de alguns trabalhos isolados. No Estado da Bahia são conhecidas 14 espécies de holoturoides todavia, a maioria destes registros foi realizada apenas na descrição original de cada uma destas espécies, ou seja, há mais de um século. Além de muito antigas, grande parte destas descrições foram baseadas em apenas um espécime ou em formas jovens, com poucas ou até mesmo nenhuma ilustração, dificultando ainda mais o entendimento do grupo e certamente perpetuando erros de identificação. Desta forma, o objetivo deste trabalho foi realizar um estudo taxonômico com os holoturóides que ocorrem no Estado da Bahia, caracterizando as espécies, identificando problemas taxonômicos, produzindo chaves de identificação e descrevendo novos táxons. Além de material obtido através de museus, foram realizadas coletas em diversas regiões do estado (região metropolitana de Salvador, Baía de Todos-os-Santos, Litoral Norte e Sul da Bahia), da zona entre-marés (coleta manual) ao infralitoral raso (20 m de profundidade por meio de mergulho livre e mergulho autônomo), e em regiões mais profundas (50 m) por dragagem com auxílio de amostrador de fundo do tipo van Veen. Quatro espécies tiveram o primeiro registro para o nordeste do Brasil — Isostichopus badionotus, Holothuria (Thymiosycia) arenicola, Pentamera pulcherrima e Stolus cognatus — e duas para o Atlântico Sul Ocidental — Holothuria (Theelothuria) princeps e Thyone pawsoni. Além disto, um gênero novo (Coronatum) e duas espécies novas (Cucumaria solangeae e Coronatum baiensis) foram descritas, e duas sinonímias e duas novas combinações foram propostas. Para cada espécie, apresenta-se diagnose e redescrição (quando necessário), notas ecológicas, localização do material-tipo e distribuição. Foram acrescentadas imagens (inéditas para a maioria) dos ossículos dérmicos em microscopia eletrônica de varredura, fotografia da espécie (in situ e fixada) e do anel calcário. Por fim, apresentam-se chaves de identificação para as ordens, famílias e espécies da classe Holothuroidea. / Salvador
2

A critical assessment of the dendrochirotid subfamilies, sclerodactylinae and thyoninae, with the taxonomic management of the "supergenus" thyone (echinodermata : holothuroidea)

Arumugam, Preyan. 10 October 2013 (has links)
The key character separating the dendrochirotid families Sclerodactylidae (sensu Pawson & Fell, 1965) and the Phyllophoridae (sensu Pawson & Fell, 1965), i.e. entire or undivided radial processes to the calcareous ring in the former and sub-divided processes in the latter, is unjustified since most sclerodactylid species also have subdivided processes. It is here assumed that the basis of elevating the subfamily Sclerodactylinae Panning to family level was established on a misinterpretation or mistranslation of the original diagnosis of this subfamily or a lapsus calumni meaning “plates” instead of “processes”. Panning (1949) categorically states that the processes in the Sclerodactylinae are composed of 3–4 large pieces of calcite and only as an exception they are unbroken. Since Pawson & Fell gave no other distinction between the Sclerodactylidae and the Phyllophoridae, the former is here considered an invalid taxon and its three current subfamilies (Sclerodactylinae, Sclerothyoninae Thandar and Cladolabinae Heding & Panning) are re-assigned to the Phyllophoridae. This family now includes six subfamilies: Cladolabinae, Phyllophorinae Östergren, Sclerodactylinae, Sclerothyoninae, Semperiellinae Heding & Panning and Thyoninae Panning. The diagnosis of the Sclerodactylinae, restricted by Thandar (1989), is now modified to include also those forms whose radial and interradial plates may be slightly sub-divided but still form a short tube. Of the eleven genera placed within this subfamily subsequent to its erection, only ten of these remain. Neothyone Deichmann is a preoccupied name for which Lisacucumis is here proposed as a replacement. Thandar’s (1989) diagnosis of the Thyoninae is here accepted, however, the genus Thorsonia Heding is transferred to the Sclerodactylinae. Of the 66 nominal species which currently stand in the “supergenus” Thyone Jaeger, 10 are transferred to Havelockia Pearson within the Sclerodactylinae, while one species is regarded as a synonym of H. herdmani Pearson. In addition, six species are transferred to Stolus Selenka within the Thyoninae. Finally, three species are transferred to Sclerothyoninae, two within Sclerothyone Thandar and one within Temparena Thandar. Two species show an uncertain affinity to Thyone and are temporally removed from the genus. Furthermore, two species currently classified within Havelockia are transferred to Thyone. The now remaining 46 species are separated into seven groups based on the composition of their introvert deposits: tables only (8 spp.), rosettes only (5 spp.), tables and rosettes (21 spp.), tables and plates/?reduced tables (2 spp.), rosettes and plates/?reduced tables (3 spp.), plates only (2 spp.), or introvert deposits absent or unknown (5 spp.). Regrettably, no other character could be used in conjunction with the above to suggest at least sub-generic levels. Within the genus Havelockia, Cucumaria redimita Sluiter indicates an affinity with Pentamera Ayres. It is here transferred to this genus within the Thyoninae. Havelockia, now containing 17 species, is also revised. Keys, diagnoses and figures are provided for all nominal species now included in Thyone and Havelockia. / Thesis (M.Sc.)-University of KwaZulu-Natal, Westville, 2011.

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