Skeletal anatomical description of Isogomphodon oxyrhynchus (Müller & Henle, 1839) and discussion of its phylogenetic position within Carcharhinidae (Chondrichthyes, Carcharhiniformes)
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da USP |
Texto Completo: | https://doi.org/10.11606/D.38.2021.tde-15042021-152715 |
Resumo: | The Daggernose shark Isogomphodon oxyrhynchus (Müller & Henle, 1839), sole species in its genus, is endemic to northern South America, from Southern Maranhão State in Brazil to Trinidad and Tobago. Although the species is traditionally classified as estuarine, it occurs also in entirely marine environments. Such habitat shift is seasonal, related to the rain regimen. I. oxyrhynchus is easily recognized by the elongated snout, enlarged pectoral fins and reduced eyes, characteristics which account for its unique general aspect in the family Carcharhinidae. The anatomy of I. oxyrhynchus remains poorly known and its phylogenetic position is still controversial. In this study, we propose a contribution to the knowledge of I. oxyrhynchus, offering: 1. A description of the entire skeleton and dermal denticles, based on dissections, computerized tomography and Scanning Electron Microscopy; 2. A comparative anatomical study of I. oxyrhynchus with other representatives of Carcharhinidae, which is compared with results from a novel molecular analysis; 3. Review of fossil taxa assigned to Isogomphodon. The skeletal description revealed much new information for I. oxyrhynchus, including new information on complexes which were previously entirely unknown in the taxon, such as the appendicular skeleton, mandibular arch and clasper. The comparative and phylogenetic study is organized into 46 morphological characters, which qualitatively supports Carcharhinus porosus as sister-group of I. oxyrhynchus. Results also support the hypothesis of Isogomphodon as a modified member of the genus Carcharhinus. Lastly, a critical review of the fossil taxa assigned to Isogomphodon demonstrated that from the five species previously assigned to Isogomphodon, only two can be positively attributed to the genus. |
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info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis Skeletal anatomical description of Isogomphodon oxyrhynchus (Müller & Henle, 1839) and discussion of its phylogenetic position within Carcharhinidae (Chondrichthyes, Carcharhiniformes) Descrição anatômica do esqueleto de Isogomphodon oxyrhynchus (Müller & Henle, 1839) e discussão sobre seu posicionamento filogenético dentro de Carcharhinidae (Chondrichthyes, Carcharhiniformes) 2021-03-25Mario Cesar Cardoso de PinnaThiago Silva LobodaGavin Jeremy Preston NaylorFlávia de Figueiredo PeteanArthur de Lima Oliveira e SilvaUniversidade de São PauloSistemática, Taxonomia Animal e BiodiversidadeUSPBR Anatomia Anatomia comparada Anatomy Carcharhinidae Carcharhinidae Comparative anatomy CT-Scan CT-Scan Esqueleto Fossil Fóssil Isogomphodon oxyrhynchus Isogomphodon oxyrhynchus Skeletal The Daggernose shark Isogomphodon oxyrhynchus (Müller & Henle, 1839), sole species in its genus, is endemic to northern South America, from Southern Maranhão State in Brazil to Trinidad and Tobago. Although the species is traditionally classified as estuarine, it occurs also in entirely marine environments. Such habitat shift is seasonal, related to the rain regimen. I. oxyrhynchus is easily recognized by the elongated snout, enlarged pectoral fins and reduced eyes, characteristics which account for its unique general aspect in the family Carcharhinidae. The anatomy of I. oxyrhynchus remains poorly known and its phylogenetic position is still controversial. In this study, we propose a contribution to the knowledge of I. oxyrhynchus, offering: 1. A description of the entire skeleton and dermal denticles, based on dissections, computerized tomography and Scanning Electron Microscopy; 2. A comparative anatomical study of I. oxyrhynchus with other representatives of Carcharhinidae, which is compared with results from a novel molecular analysis; 3. Review of fossil taxa assigned to Isogomphodon. The skeletal description revealed much new information for I. oxyrhynchus, including new information on complexes which were previously entirely unknown in the taxon, such as the appendicular skeleton, mandibular arch and clasper. The comparative and phylogenetic study is organized into 46 morphological characters, which qualitatively supports Carcharhinus porosus as sister-group of I. oxyrhynchus. Results also support the hypothesis of Isogomphodon as a modified member of the genus Carcharhinus. Lastly, a critical review of the fossil taxa assigned to Isogomphodon demonstrated that from the five species previously assigned to Isogomphodon, only two can be positively attributed to the genus. O cação-pato Isogomphodon oxyrhynchus (Müller & Henle, 1839), única espécie em seu gênero, é endêmica da porção norte da América Sul, do Sul do Maranhão ao arquipélago de Trinidad e Tobago. Embora tradicionalmente seja classificada como estuarina, sua área de ocorrência inclui localidades de água inteiramente salgada, sendo tal mudança de habitat um fenômeno sazonal correlacionado com o regime de chuvas. I. oxyrhynchus é facilmente reconhecido pelo alongamento do focinho, nadadeiras peitorais largas e olhos diminutos, características que lhe outorgam um aspecto geral único na família Carcharhinidae. A anatomia e posicionamento filogenético de I. oxyrhynchus ainda permanecem pouco conhecidos ou controversos. No presente trabalho, propomos uma contribuição ao conhecimento da espécie, oferecendo: 1. Descrição completa do esqueleto e dentículos dérmicos, realizada através de dissecções, tomografia computadorizada e Microscopia Eletrônica de Varredura; 2. Estudo da anatomia comparada de I. oxyrhynchus com outros membros de Carcharhinidae, para obtenção de subsídios relevantes para o entendimento de seu posicionamento filogenético na família, sendo esta avaliada também de acordo com uma nova filogenia molecular; 3. Revisão crítica dos registros fósseis alocados em Isogomphodon. A descrição do esqueleto da espécie trouxe informações novas sobre todos os complexos esqueléticos, sendo que o esqueleto apendicular, arco mandibular e clásper são inteiramente inéditos. O estudo comparativo e filogenético propõe 46 caracteres morfológicos potencialmente informativos, indicando Carcharhinus porosus como o provável grupo irmão de I. oxyrhynchus. Os resultados também suportam a hipóteses de Isogomphodon como um membro modificado do gênero Carcharhinus. Por fim, a revisão dos registros fósseis demonstrou que das cinco espécies descritas como Isogomphodon, apenas duas podem positivamente ser atribuídas ao gênero. https://doi.org/10.11606/D.38.2021.tde-15042021-152715info:eu-repo/semantics/openAccessengreponame:Biblioteca Digital de Teses e Dissertações da USPinstname:Universidade de São Paulo (USP)instacron:USP2023-12-21T19:00:58Zoai:teses.usp.br:tde-15042021-152715Biblioteca Digital de Teses e Dissertaçõeshttp://www.teses.usp.br/PUBhttp://www.teses.usp.br/cgi-bin/mtd2br.plvirginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.bropendoar:27212023-12-22T12:41:52.941404Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false |
dc.title.en.fl_str_mv |
Skeletal anatomical description of Isogomphodon oxyrhynchus (Müller & Henle, 1839) and discussion of its phylogenetic position within Carcharhinidae (Chondrichthyes, Carcharhiniformes) |
dc.title.alternative.pt.fl_str_mv |
Descrição anatômica do esqueleto de Isogomphodon oxyrhynchus (Müller & Henle, 1839) e discussão sobre seu posicionamento filogenético dentro de Carcharhinidae (Chondrichthyes, Carcharhiniformes) |
title |
Skeletal anatomical description of Isogomphodon oxyrhynchus (Müller & Henle, 1839) and discussion of its phylogenetic position within Carcharhinidae (Chondrichthyes, Carcharhiniformes) |
spellingShingle |
Skeletal anatomical description of Isogomphodon oxyrhynchus (Müller & Henle, 1839) and discussion of its phylogenetic position within Carcharhinidae (Chondrichthyes, Carcharhiniformes) Arthur de Lima Oliveira e Silva |
title_short |
Skeletal anatomical description of Isogomphodon oxyrhynchus (Müller & Henle, 1839) and discussion of its phylogenetic position within Carcharhinidae (Chondrichthyes, Carcharhiniformes) |
title_full |
Skeletal anatomical description of Isogomphodon oxyrhynchus (Müller & Henle, 1839) and discussion of its phylogenetic position within Carcharhinidae (Chondrichthyes, Carcharhiniformes) |
title_fullStr |
Skeletal anatomical description of Isogomphodon oxyrhynchus (Müller & Henle, 1839) and discussion of its phylogenetic position within Carcharhinidae (Chondrichthyes, Carcharhiniformes) |
title_full_unstemmed |
Skeletal anatomical description of Isogomphodon oxyrhynchus (Müller & Henle, 1839) and discussion of its phylogenetic position within Carcharhinidae (Chondrichthyes, Carcharhiniformes) |
title_sort |
Skeletal anatomical description of Isogomphodon oxyrhynchus (Müller & Henle, 1839) and discussion of its phylogenetic position within Carcharhinidae (Chondrichthyes, Carcharhiniformes) |
author |
Arthur de Lima Oliveira e Silva |
author_facet |
Arthur de Lima Oliveira e Silva |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Mario Cesar Cardoso de Pinna |
dc.contributor.advisor-co1.fl_str_mv |
Thiago Silva Loboda |
dc.contributor.referee1.fl_str_mv |
Gavin Jeremy Preston Naylor |
dc.contributor.referee2.fl_str_mv |
Flávia de Figueiredo Petean |
dc.contributor.author.fl_str_mv |
Arthur de Lima Oliveira e Silva |
contributor_str_mv |
Mario Cesar Cardoso de Pinna Thiago Silva Loboda Gavin Jeremy Preston Naylor Flávia de Figueiredo Petean |
description |
The Daggernose shark Isogomphodon oxyrhynchus (Müller & Henle, 1839), sole species in its genus, is endemic to northern South America, from Southern Maranhão State in Brazil to Trinidad and Tobago. Although the species is traditionally classified as estuarine, it occurs also in entirely marine environments. Such habitat shift is seasonal, related to the rain regimen. I. oxyrhynchus is easily recognized by the elongated snout, enlarged pectoral fins and reduced eyes, characteristics which account for its unique general aspect in the family Carcharhinidae. The anatomy of I. oxyrhynchus remains poorly known and its phylogenetic position is still controversial. In this study, we propose a contribution to the knowledge of I. oxyrhynchus, offering: 1. A description of the entire skeleton and dermal denticles, based on dissections, computerized tomography and Scanning Electron Microscopy; 2. A comparative anatomical study of I. oxyrhynchus with other representatives of Carcharhinidae, which is compared with results from a novel molecular analysis; 3. Review of fossil taxa assigned to Isogomphodon. The skeletal description revealed much new information for I. oxyrhynchus, including new information on complexes which were previously entirely unknown in the taxon, such as the appendicular skeleton, mandibular arch and clasper. The comparative and phylogenetic study is organized into 46 morphological characters, which qualitatively supports Carcharhinus porosus as sister-group of I. oxyrhynchus. Results also support the hypothesis of Isogomphodon as a modified member of the genus Carcharhinus. Lastly, a critical review of the fossil taxa assigned to Isogomphodon demonstrated that from the five species previously assigned to Isogomphodon, only two can be positively attributed to the genus. |
publishDate |
2021 |
dc.date.issued.fl_str_mv |
2021-03-25 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://doi.org/10.11606/D.38.2021.tde-15042021-152715 |
url |
https://doi.org/10.11606/D.38.2021.tde-15042021-152715 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo |
dc.publisher.program.fl_str_mv |
Sistemática, Taxonomia Animal e Biodiversidade |
dc.publisher.initials.fl_str_mv |
USP |
dc.publisher.country.fl_str_mv |
BR |
publisher.none.fl_str_mv |
Universidade de São Paulo |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da USP instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Biblioteca Digital de Teses e Dissertações da USP |
collection |
Biblioteca Digital de Teses e Dissertações da USP |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
virginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.br |
_version_ |
1794502755590602752 |