| Journal: | Revista brasileira de zoologia |
| Database: | PERIÓDICA |
| System number: | 000281104 |
| ISSN: | 0101-8175 |
| Authors: | Almeida, Waltecio de Oliveira1 Christoffersen, Martin Lindsey Amorim, Dalton de Souza2 Garraffoni, André Rinaldo Senna3 Silva, Gustavo Sene |
| Institutions: | 1Universidade Federal da Paraiba, Departamento de Sistematica e Ecologia, Joao Pessoa, Paraiba. Brasil 2Universidade de Sao Paulo, Faculdade de Filosofia, Ciencias e Letras de Ribeirao Preto, Ribeirao Preto, Sao Paulo. Brasil 3Universidade Federal do Parana, Centro de Estudos do Mar, Pontal do Parana, Parana. Brasil |
| Year: | 2003 |
| Season: | Mar |
| Volumen: | 20 |
| Number: | 1 |
| Pages: | 23-57 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | Polychaetes are metameric worms recognized for having parapodia, chaetae, and nuchal organs. Some authors have extended the Annelida to include Pogonophora, Echiura, and Clitellata. These suggestions are insufficient to generate a monophyletic group. They do not take into account two very large and important clades that in a cladistic analysis at a higher level are shown to be nested within the Annelida: the Ecdysozoa (arthropods and related taxa) and Enterocoela (deuterostomes and related taxa). Evolutionary histories of most characters across metazoan phyla are still very poorly known. Metameres and coeloms have been considered homoplastic in the literature, and yet the homeobox genes responsible for the expression of metamerism and of paired appendages, at least, are very largely distributed among the Metazoa. A phylogenetic analysis was performed for the ingroups of Polychaeta, including Clitellata, Enterocoela, and Ecdysozoa as terminal taxa. The remaining non-metameric phyla Platyhelminthes, Nemertea, Mollusca, and Sipuncula were included to root the tree within the Bilateria. Empirical data was obtained from the literature and run with the software Hennig86 with two comparative interpretations of a priori hypotheses of primary homology: one with negative characters (coding losses) and another considering only positive characters (without assumptions about losses). The most relevant conclusions are: (1) Annelida and Polychaeta are non-monophyletic, even when including Echiura, Clitellata, and Pogonophora; (2) Articulata, as t |
| Disciplines: | Biología |
| Keyword: | Evolución y filogenia, Invertebrados, Análisis filogenético, Cladística, Ecdysozoa, Metazoa, Annelida, Polychaeta |
| Keyword: | Biology, Evolution and phylogeny, Invertebrates, Phylogenetic analysis, Cladistics, Ecdysozoa, Metazoa, Annelida, Polychaeta |
| Full text: | Texto completo (Ver HTML) |
