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| Author(s): |
Maíra Portella Ragno
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) |
| Defense date: | 2013-12-16 |
| Examining board members: |
Marcelo Rodrigues de Carvalho;
Ulisses Leite Gomes;
George Mendes Taliaferro Mattox
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| Advisor: | Marcelo Rodrigues de Carvalho |
| Abstract | |
Batoidea includes all the rays and its monophyly is well-corroborated. However, the phylogenetic interrelationships within the group are still debatable. Some phylogenies consider Pristiformes as the basal group of Batoidea while others considered Torpediniformes the most basal group. Rhinobatiformes are seen as a monophyletic group by some authors and as paraphyletic by others. Phylogenetic positioning problems also are found within the genders of Torpediniformes, Rhinobatiformes, Rajiformes and Myliobatiformes. The distribution of the canals of the lateral line sensory system presents wide variation between batoid groups, and although this system is not well studied in elasmobranchs, its constitutes an important source of phylogenetic characters. The master\'s project bound to this proposal aimed to describe the distribution and morphology of the canals of the lateral line sensory system in Batoidea, gathering possible characters with phylogenetic relevance which may help elucidate the phylogenetic problems in this group. Based on the analysis of the patterns found in 55 species of 39 genders an 18 families of Batoidea and on information reviewed from literature 13 characters were proposed, which one was discussed according the phylogenetic questions within Batoidea. Therefore, problems such as the basal group in Batoidea and the position of Platyrhyna and Zanobatus could be discussed as much as the monophyly of Myliobatiformes and its internal groups (AU) | |
| FAPESP's process: | 11/04647-3 - Distribution and morphology of lateral line canals in rays and its systematic relevance (Chondrichthyes: Elasmobranchii: Batoidea) |
| Grantee: | Maíra Portella Ragno |
| Support Opportunities: | Scholarships in Brazil - Master |