The enigmatic Amazonian genus Eutrachelophis: morphological evidence and description of new taxa (Serpentes: Dipsadidae: Xenodontini)

Autor(es)

Zaher, Hussam ^[1] ; Prudente, Ana L. C. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Museu Zool, Ave Nazare 481, BR-04263000 Sao Paulo - Brazil

^[2] Museu Paraense Emilio Goeldi, Lab Herpetol, Ave Perimetral 1901, CP 399, BR-66040170 Belem, Para - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Amphibia-Reptilia; v. 41, n. 2, p. 215-231, MAY 2020.
• Citações Web of Science: 0

Resumo

Eutrachelophis contains two species - Eu. bassleri and Eu. steinbachi - that are known from the lowland rainforests of western Amazonia (Ecuador, Peru, and Bolivia). Due to their unusual hemipenial morphology, they have been considered to belong to a separate tribe - Eutrachelophiini - of dipsadids. Here, we describe a new species of Eutrachelophis that fills an important morphological gap in the hemipenial pattern known for this genus. Although highly modified, apical disks are recognizable in the hemipenes of both species, supporting their inclusion in the tribe Xenodontini. We further allocate Eu. steinbachi in a new genus, due to the contrasting morphological disparities and lack of uniquely derived features shared with the remaining species of Eutrachelophis. The new genus can be distinguished from all other genera of Dipsadidae by the presence of deeply divided lobes with lobular projections that expand beyond the tip of the sulci, the latter ending on the middle surface of the lobes where it opens at the base of a small nude area considered to be the remnant of the Xenodontini apical disks. The two remaining species of Eutrachelophis retain well-developed Xenodontini apical disks that are expanded throughout the lobular region reaching each other's edges at midline due to the fusion of both lobes in one unique structure. The condition observed in the genus Lvgophis is morphologically intermediate between the highly specialized condition present in Eutrachelophis and the one known to characterize other Xenodontini, supporting the allocation of this genus in the tribe. (AU)

• Processo FAPESP: 11/50206-9 - Origem e evolução das serpentes e a sua diversificação na região neotropical: uma abordagem multidisciplinar
• Beneficiário: Hussam El Dine Zaher
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 18/11902-9 - Origem e diversificação dos grandes grupos de serpentes: fósseis-chaves basais e a irradiação Cenozóica de Colubroides (Squamata)
• Beneficiário: Hussam El Dine Zaher
• Modalidade de apoio: Bolsas no Exterior - Pesquisa