Integrative Taxonomy of Amphisbaenid Lizards in South America
Summary
Integrative taxonomy of amphisbaenid lizards in South America combines morphological data, molecular phylogenetics, morphometrics and ecological information to reveal substantial cryptic diversity within this fossorial group. Historically, species delineation relied heavily on external meristic characters such as annuli counts and scale morphology, leading to an underestimation of true diversity. Recent application of mitochondrial and nuclear DNA sequences has uncovered deep genetic divergences among populations previously regarded as single species, prompting the description of new lineages. Geometric morphometric analyses of skull and body shape, linked with habitat modelling, have further refined species boundaries and identified ecomorphological adaptations to distinct soil types and microhabitats. This holistic framework has reshaped our understanding of biogeographical patterns across major South American biomes, from the Amazon Basin to the Espinhaço Range and Orinoquian savannahs, and has emphasised the conservation importance of isolated montane and transitional landscapes as centres of endemism.
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Technical terms
Integrative taxonomy: A multidisciplinary approach combining morphology, genetics, ecology and other data to delineate species.
Annuli: Ring-like body segments in amphisbaenians used as meristic characters for species identification.
Meristic characters: Countable anatomical features, such as scales or pores, employed in taxonomic diagnosis.
Mitochondrial DNA (mtDNA): Genetic material from mitochondria, frequently used in phylogenetic studies due to its high mutation rate.
Phylogenetic clade: A group of organisms derived from a common ancestor, identified through genetic analysis.
References
- A new species of Amphisbaena (Squamata: Amphisbaenidae) from the Orinoquian region of Colombia. Vertebrate Zoology (2021).
- A new four-pored Amphisbaena Linnaeus, 1758 (Amphisbaenia, Amphisbaenidae) from the north of Espinhaço Mountain Range, Brazil. ZooKeys (2024).
- An aid to the identification of the South American species of Amphisbaena (Squamata, Amphisbaenidae). Papéis Avulsos de Zoologia (2002).
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