An evolutionary paradox on threadsnakes: Phenotypic and molecular evidence reveal a new and remarkably polymorphic species of Siagonodon (Serpentes: Leptotyphlopidae: Epictinae) from Amazonia

Threadsnakes are known for their conserved external morphology and historically controversial systematics, challenging taxonomic, biogeographic and evolutionary researches in these fields. Recent morphological studies—mostly based on µCT data of the skull and lower jaw—have resolved systematic issue...

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Bibliographic Details
Published in:Vertebrate zoology 2023-04, Vol.73, p.345-366
Main Authors: Martins, Angele, Folly, Manuella, Ferreira, Guilherme Nunes, Garcia da Silva, Antônio Samuel, Koch, Claudia, Fouquet, Antoine, Machado, Alessandra, Lopes, Ricardo Tadeu, Pinto, Roberta, Rodrigues, Miguel Trefaut, Passos, Paulo
Format: Article
Language:English
Subjects:
Biogeography
Evolution
Jaw
Leptotyphlopidae
Mandible
Morphology
Museums
Natural history
New species
New taxa
Phylogenetics
Phylogeny
Protected areas
Snakes
Software
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Summary:Threadsnakes are known for their conserved external morphology and historically controversial systematics, challenging taxonomic, biogeographic and evolutionary researches in these fields. Recent morphological studies—mostly based on µCT data of the skull and lower jaw—have resolved systematic issues within the group, for instance leading to the description of new taxa or re-positioning little-known scolecophidian taxa in the tree of life. Herein we describe a new polymorphic species of the genus Siagonodon from Amazonia based on morphological (external, osteology and hemipenis) and molecular data, and provide the first hemipenial description for the genus. We also reassign Siagonodon acutirostris to the genus Trilepida based on osteological data in combination with molecular evidence. The new species described represents an evolutionary paradox for scolecophidians because the species displays a remarkable variation in the shape of the snout region that is otherwise always highly conserved in this clade. Finally, this study reinforces the importance of protected areas as essential in maintaining vertebrate populations, including those that are not yet formally described.
ISSN:1864-5755
2625-8498
DOI:10.3897/vz.73.e98170