| Texto completo | |
| Autor(es): |
Rachid, Lucas S. F.
;
Luzete, Juliana
;
Cassimiro, Jose
;
Rodrigues, Miguel Trefaut
;
Pellegrino, Katia C. M.
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | South American Journal of Herpetology; v. 35, p. 10-pg., 2025-08-01. |
| Resumo | |
The Neotropical lizard family Alopoglossidae currently comprises 32 species inhabiting the leaf litter of subtropical and tropical forests in northern South America. Recent studies based on morphological, osteological, and genetic data confirmed the monophyly of the family and revealed cryptic diversity within it. Alopoglossus angulatus exhibits a broad distribution across eastern Amazonia in Brazil, Suriname, Guyana, and French Guiana. Cytogenetic investigation is pivotal for phylogenetic research, providing insights into systematics and interspecific relationships. Despite recent advancements, a significant knowledge gap persists regarding chromosomal evolution within Gymnophthalmoidea. This study presents the first karyotype description for a species of Alopoglossidae, A. angulatus, which unexpectedly possesses the lowest diploid chromosome number reported to date among gymnophthalmoid lizards. Utilizing conventional staining and Ag-NOR, we describe the karyotype of A. angulatus (2n = 24), which consists of 12 macrochromosomes and 12 microchromosomes, with a putative XX:XY sex-determination system requiring further validation. All macrochromosomes are biarmed, and at least three pairs of microchromosomes exhibit a similar morphology. Furthermore, the NOR site coincides with a secondary constriction on chromosome pair 2, and we discuss its implications for chromosomal evolution within the group. To evaluate the potential influence of chromosomal changes on diversification, we employed a probabilistic testto inferthe ancestral diploid number for Gymnophthalmoidea. The best-fitting model indicates an ancestral diploid chromosome number of 2n = 42, implying that chromosomal fissions and fusions played a significant role in karyotype evolution. The low diploid number for A. angulatus suggests a high rate of chromosome fusions within this lineage; however, this hypothesis requires confirmation through karyotyping additional species within this poorly characterized family. These findings underscore the relevance of cytogenetic data for elucidating chromosome evolution in this clade. (AU) | |
| Processo FAPESP: | 22/07247-0 - Evolução da determinação e dimorfismo sexual em Squamata: relações com parâmetros ecológicos e desenvolvimento embrionário |
| Beneficiário: | Juliana Luzete Monteiro |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| 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: | 20/14780-1 - Evo-Devo em ambientes dinâmicos: implicações das mudanças climáticas na biodiversidade |
| Beneficiário: | Tiana Kohlsdorf |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOTA - Temático |