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| Author(s): |
Maximiliano Manuel Maronna
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) |
| Defense date: | 2014-09-12 |
| Examining board members: |
Antonio Carlos Marques;
Fábio Sarubbi Raposo do Amaral;
Diogo Meyer;
Otto Müller Patrão de Oliveira;
Tatiana Teixeira Torres
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| Advisor: | Antonio Carlos Marques |
| Abstract | |
In modern evolutionary research considering lineages such as the Hydrozoa, one of the major challenges is the proposal of historical relationships between their main groups. From a \"traditional\" life cycle in Medusozoa, defined by a metagenesis process (the generation of a pelagic adult phase from a benthic polyp), the lineages exhibit a diverse array of life cycles and species richness, with Leptothecata being considered the richest group in number of species. New molecular data for diverse Hydrozoa species, particularly from Leptothecata, were generated to combine with available genetic information. From new multilocus and single gene matrices of ribosomal markers, different analyses were created to infer and evaluate phylogenies, as well as to define and establish the impact of used methods on data treatment and nodal support to Hydrozoa, and more specifically, Leptothecata.The results allow proposing new basic systematic relationships in Hydroidolina, as well as a new taxonomic classification for Leptothecata. From this phylogenetic scenario, potential phenomena that may have promoted the macroevolutionary pattern of the group are presented and discussed. Questions and challenges from evolutionary genetics, which may be relevant in the evolution of the group, are presented as nexus for future studies in the final chapter (AU) | |