Autor(es)

Beyer, Maila ; Thode, Veronica Aydos ; Lohmann, Lucia G.

• Tipo de documento: Artigo Científico
• Fonte: SYSTEMATIC BOTANY; v. 50, n. 1, p. 15-pg., 2025-01-01.

Resumo

The study reconstructs the molecular phylogeny and biogeographical history of Stizophyllum (Bignonieae, Bignoniaceae), a small genus of Neotropical lianas, distributed from southern Brazil to Central America. We sampled 33 individuals representing the breadth of morphological variation and geographical distribution of the three species recognized to date, i.e., Stizophyllum inaequilaterum, Stizophyllum perforatum, and Stizophyllum riparium. Bayesian and maximum likelihood approaches led to congruent topologies. A putative new species from Amazonia collected in the Brazilian state of Para, Stizophyllum coriaceum, sp. nov., was recovered as sister to the remaining species of the genus, confirming that it represents a distinct taxon. Furthermore, all Stizophyllum riparium from Central America emerged as a separate clade, leading to the reestablishment of Stizophyllum punctifolium. These findings corroborate a broader circumscription of Stizophyllum perforatum (including all Stizophyllum from the Brazilian Atlantic Forest and Dry Diagonal) and a narrower circumscription of Stizophyllum inaequilaterum (restricted to Western Amazonia and Central America), while indicating that Stizophyllum riparium is not monophyletic and best divided into two taxa: Stizophyllum riparium and Stizophyllum punctifolium. The molecular phylogenetic findings are corroborated by morphological data, and the appropriate taxonomic changes are proposed. In sum, a broader Stizophyllum, with five species is recognized, and an updated synopsis of the genus is presented. Divergence time estimates indicate that the stem node of Stizophyllum originated during the late Eocene, while most of the diversification within the genus occurred much later during the Miocene and Pliocene, periods of intense geological activity in South America. Ancestral area reconstructions inferred Lowland Amazonia as the most likely distribution of the MRCA of Stizophyllum. Five dispersal events and three local extinction events led to the current distribution of the genus. (AU)

• Processo FAPESP: 18/23899-2 - Projeto de Perfuração Transamazônica: origem e evolução das florestas, clima e hidrologia dos trópicos da América do Sul
• Beneficiário: André Oliveira Sawakuchi
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 12/50260-6 - Estruturação e evolução da biota amazônica e seu ambiente: uma abordagem integrativa
• Beneficiário: Lúcia Garcez Lohmann
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático