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| Author(s): |
Juliana Cristina Bertacini de Moraes
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: | 2016-11-22 |
| Examining board members: |
Sergio Luiz de Siqueira Bueno;
Fernando Luis Medina Mantelatto;
André Carrara Morandini;
Sandro Santos
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| Advisor: | Sergio Luiz de Siqueira Bueno |
| Abstract | |
The South American endemic genus Aegla represents the only anomuran decapod crustaceans strictly living in freshwaters. Marine fossil records left no doubts regarding the origin of the group. A number of studies on taxonomy, morphology and geographical distribution of aeglid have been carried out. Nevertheless, morphology based phylogenetic information about the group is limited to studies of the positioning of Aeglidae into the Anomuran infraorder and one pioneer work which presented a cladogram for seven species from Chile. Through cladistic analysis based on morphological characters of Aegla species occurring in the upper Paraná and upper Uruguay hydrographic basins the following results were obtained: 1. The non-monophyletic condition of the upper Paraná-upper Uruguay clade; 2. Aegla leptochela phylogenetically related to other species from Alto Ribeira; 3. Aegla marginata is paraphyletic, constituting a complex with Aegla quilombola n. sp.; 4. Aegla franca and A. perobae are sister species; 5. Aegla lata and other species were related with populations from different hydrographic basins, showing the lack of derived characters in Aeglidae and the possibility of existence of other species complexes in this family; 6. Invasion to the underground environments occurred more than once and the stygobiont species are not exclusive reciprocal sisters; 7. Aegla paulensis is a species complex encompassing seven species: Aegla paulensis s. str., A. rosanae, A. lancinhas, A. japi n. sp., A. jaragua n. sp., A. jundiai n. sp. e A. vanini n. sp.. In addition, scanning electron microscopy revealed two main types of sexual tubes (long and narrow; short and wide) in males from 39 Aegla species. Each species has a specific set of characters for this structure, hence indicating it can be used as diagnostic character in taxonomic descriptions (AU) | |
| FAPESP's process: | 12/16083-0 - Taxonomic revision and cladistic analysis of Aegla Leach, 1820 (Crustacea, Anomura, Aeglidae) from High Paraná and High Uruguay basins |
| Grantee: | Juliana Cristina Bertacini de Moraes |
| Support Opportunities: | Scholarships in Brazil - Doctorate |