Repeated evolution of terrestrial lineages in a continental lizard radiation

Lajmi, Aparna; Verma, Anjali; Karanth, K. Praveen

doi:10.1111/jeb.13544

Cited by 7 publications

(2 citation statements)

References 59 publications

(90 reference statements)

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“…The geological and climatic history of this region has provided multiple opportunities for diversification and speciation of morphologically distinct lineages [52]. A majority of the diversification within these genera occurred during the Miocene (~24 mya and~20 mya for Indirana and Walkerana respectively), coinciding with a period of shift in vegetation along with the intensification of monsoon seasonality [53,54]. Hence, the creation of an ecological gradient along with geographic isolation could have led to the allopatric speciation of ancient morphologically distinct lineages such as Walkerana phyrnoderma [55].…”

Section: Plos Onementioning

confidence: 99%

“…Given that Indirana/Walkerana habits/niches may be largely similar, perhaps morphological stasis has been favored. Thus, lowland lineages such as Indirana semipalmata may have remained morphologically cryptic due to an inability to exploit novel niches or as a result of decoupling between lineage and morphological diversification, as shown in Hemidactylus geckos [54].…”

Section: Plos Onementioning

confidence: 99%

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Determining levels of cryptic diversity within the endemic frog genera, Indirana and Walkerana, of the Western Ghats, India

et al. 2020

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A large number of species in the tropics are awaiting discovery, many due to their cryptic morphology ie. lack of discernable morphological difference. We explored the presence of cryptic lineages within the frog genera, Indirana and Walkerana, which are endemic to the Western Ghats of Peninsular India. By reconstructing a phylogeny using 5 genes and robust geographic sampling, we delimited 19 lineages along a population-species continuum, using multiple criteria including haplotype clusters, genetic distance, morphological distinctness, and geographical separation. Of these 19 lineages, 14 belonged to the genus Indirana and 5 to the genus Walkerana. Divergence dating analyses revealed that the clade comprising Indirana and Walkerana began diversifying around 71 mya and the most recent common ancestor of Indirana and Walkerana split around 43 mya. We tested for the presence of cryptic lineages by examining the relationship between genetic and morphological divergence among related pairs within a pool of 15 lineages. The pairs showed strong morphological conservatism across varying levels of genetic divergence. Our results highlight the prevalence of morphologically cryptic lineages in these ancient endemic clades of the Western Ghats. This emphasizes the significance of other axes, such as geography, in species delimitation. With increasing threats to amphibian habitats, it is imperative that cryptic lineages are identified so that appropriate conservation measures can be implemented.

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Section: Plos Onementioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

Determining levels of cryptic diversity within the endemic frog genera, Indirana and Walkerana, of the Western Ghats, India

et al. 2020

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The evolutionary history of an accidental model organism, the leopard gecko Eublepharis macularius (Squamata: Eublepharidae)

Agarwal

Bauer

Gamble

et al. 2022

Molecular Phylogenetics and Evolution

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Developmental Patterns Underlying Variation in Form and Function Exhibited by House Gecko Toe Pads

Griffing,

Gamble,

Behere

et al. 2024

Integrative and Comparative Biology

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Adhesive toe pads have evolved numerous times over lizard evolutionary history, most notably in geckos. Despite significant variation in adult toe pad morphology across independent origins of toe pads, early developmental patterns of toe pad morphogenesis are similar among distantly related species. In these distant phylogenetic comparisons, toe pad variation is achieved during the later stages of development. We aimed to understand how toe pad variation is generated among species sharing a single evolutionary origin of toe pads (house geckos—Hemidactylus). We investigated toe pad functional variation and developmental patterns in three species of Hemidactylus, ranging from highly scansorial (H. platyurus), to less scansorial (H. turcicus), to fully terrestrial (H. imbricatus). We found that H. platyurus generated significantly greater frictional adhesive force and exhibited much larger toe pad area relative to the other two species. Furthermore, differences in the offset of toe pad extension phase during embryonic development results in the variable morphologies seen in adults. Taken together, we demonstrate how morphological variation is generated in a complex structure during development and how that variation relates in important functional outcomes.

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Repeated evolution of terrestrial lineages in a continental lizard radiation

Cited by 7 publications

References 59 publications

Determining levels of cryptic diversity within the endemic frog genera, Indirana and Walkerana, of the Western Ghats, India

Determining levels of cryptic diversity within the endemic frog genera, Indirana and Walkerana, of the Western Ghats, India

The evolutionary history of an accidental model organism, the leopard gecko Eublepharis macularius (Squamata: Eublepharidae)

Developmental Patterns Underlying Variation in Form and Function Exhibited by House Gecko Toe Pads

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