| Texto completo | |
| Autor(es): |
Ferreira, Elaine
;
Dias, Iuri Ribeiro
;
Rodrigues, Miguel Trefaut
;
Carvalho, Andre L. G.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SYSTEMATICS AND BIODIVERSITY; v. 23, n. 1, p. 39-pg., 2025-12-31. |
| Resumo | |
Microendemism remains a poorly studied phenomenon within Brazil's Caatinga biome, yet recent research has revealed a number of species complexes with diverging lineages confined to narrow geographic ranges. These lineages often inhabit remote and undersampled regions lacking conservation efforts. Notable examples include the flat lizards from the Tropidurus semitaeniatus group, which comprises the broadly distributed T. semitaeniatus species complex plus T. helenae, T. jaguaribanus, and T. pinima, all endemic to the Caatinga biome. Incomplete knowledge of their taxonomic boundaries, phylogenetic relationships, and geographic distribution hinders both the formal description of new microendemic taxa and their conservation assessment. To address these gaps, we conducted a phylogenomic analysis of the T. semitaeniatus group employing ultra-conserved elements (UCEs) and investigated its microendemic diversity. Our analysis revealed that T. semitaeniatus is paraphyletic, with T. helenae emerging as sister to a clade formed by microendemic lineages of T. semitaeniatus (sensu lato), within which T. jaguaribanus is embedded. Additionally, the discovery of a new microendemic species, Tropidurus galileii sp. nov., from calcareous formations of Itagua & ccedil;u da Bahia, Brazil, exposed T. pinima as paraphyletic, revealing a novel species complex composed of multiple microendemic lineages. This finding led us to produce the first illustrated morphological guide for the T. semitaeniatus group, aimed at facilitating future comparative studies. Most species requiring taxonomic treatment in the T. semitaeniatus group exhibit morphological distinctiveness, and the number of microendemic taxa is significantly higher than previously estimated. Our findings suggest that range expansion followed by allopatric speciation is unlikely to be the sole driver of microendemism in this group. However, the specific biogeographic processes underlying the origin of microendemic lineages remain elusive. This study sheds light on the microendemic lizard diversity of the Caatinga, emphasizing the urgent need for enhanced systematic and conservation efforts.http://zoobank.org/urn:lsid:zoobank.org:pub:062DCEAA-67D9-41B9-B155-EC538BFE8182 (AU) | |
| Processo FAPESP: | 11/50146-6 - Filogeografia comparada, filogenia, modelagem paleoclimática e taxonomia de répteis e anfíbios neotropicais |
| Beneficiário: | Miguel Trefaut Urbano Rodrigues |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOTA - Temático |
| Processo FAPESP: | 16/08249-6 - Entrando na era filogenômica: avanços na sistemática de Tropiduríneos devem revelar as origens de uma complexa radiação de lagartos sulamericanos |
| Beneficiário: | André Luiz Gomes de Carvalho |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 17/20235-3 - Entrando na era Filogenômica (fase BEPE): avanços na sistemática de tropiduríneos devem revelar as origens de uma complexa radiação de lagartos sulamericanos |
| Beneficiário: | André Luiz Gomes de Carvalho |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |