India’s biogeographic history through the eyes of blindsnakes- filling the gaps in the global typhlopoid phylogeny

Sidharthan, Chinta; Karanth, K. Praveen

doi:10.1016/j.ympev.2020.107064

Cited by 16 publications

(10 citation statements)

References 54 publications

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“…The dispersal probabilities from America and India to Africa were kept low (0.01), while those from Africa to other landmasses were according to the M0. This dispersal pattern has been inferred for other Gondwanan taxa, like blind snakes (Sidharthan & Karanth, 2021) and beetles (Eberle et al, 2017).…”

Section: Methodssupporting

confidence: 71%

“…This is corroborated by the tarantula phylogeny which suggests a sister relationship between the Indian and African, rather than Madagascan, lineages. Such direct dispersal events from Africa into India have been reported in blind snakes (Sidharthan & Karanth, 2021) and beetles (Eberle et al, 2017). The alternative scenario is a stepwise dispersal from Africa first into Madagascar and subsequently into India.…”

Section: Discussionmentioning

confidence: 86%

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The tangled biogeographic history of tarantulas: An African centre of origin rules out the centrifugal model of speciation

Biswas

Chaitanya

Karanth

2023

Journal of Biogeography

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Section: Methodssupporting

confidence: 71%

Section: Discussionmentioning

confidence: 86%

The tangled biogeographic history of tarantulas: An African centre of origin rules out the centrifugal model of speciation

Biswas

Chaitanya

Karanth

2023

Journal of Biogeography

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“…The specimens used in this study were collected as part of a larger sampling carried out for a broader study to resolve the typhlopoid phylogeny (Sidharthan & Karanth, 2021). Table S1 in the supplementary materials lists the sampling locations for the specimens used in this study.…”

Section: Taxon Samplingmentioning

confidence: 99%

“…Our analysis showed that the published sequences of Indotyphlops braminus from outside India were nested within Indotyphlops cf. braminus from India suggesting that this species probably evolved in India and spread around the world (Pyron & Wallach, 2014;Sidharthan & Karanth, 2021;Wallach, 2009). Since previous studies speculated a hybrid origin for the species, and I. braminus evolved in India, here, we explore the hybrid origin hypothesis using molecular data from Indotyphlops sp.…”

Section: Introductionmentioning

confidence: 99%

A widespread commensal loses its identity: suggested taxonomic revision for Indotyphlops braminus (Scolecophidia: Typhlopidae) based on molecular data

et al. 2022

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The widespread human commensal blindsnake species Indotyphlops braminus is currently the only known obligate parthenogenetic snake species. It is also known to be triploid. However, much of these data is from specimens collected outside India which is the native range of this species. Polyploidy and parthenogenesis are often associated with hybridization in amphibians and lizards. In this study, we generated nuclear and mitochondrial data from multiple Indotyphlops lineages from across peninsular India and investigated the possible hybrid origin of I. braminus. Species delimitation suggested three putative species, one of which was I. pammeces and the other two morphologically matched I. braminus. One of these was confined to the wet zone (high rainfall areas) while the other was largely distributed in the dry zone. There was wide discordance in the relationships between these lineages across markers and different tree building approaches suggesting past or ongoing geneflow. The statistical test for hybridization also implied geneflow across these three lineages. Furthermore, the dry zone I. braminus appears to be true I. braminus as the topotypic material falls within this clade. These results suggest that the widespread, commensal, and parthenogenetic Indotyphlops is a separate species from I. braminus, and further investigation is required to determine diagnostic morphological characters for a species description.

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“…Direct dispersal from Africa to Southeast Asia and vice versa were assigned a low dispersal probability, since these landmasses were not adjacent during the time period taken into consideration here (40-0 mya). Furthermore, we divided the time period into two time slices following Sidharthan and Karanth (2021). These are 40-35 mya, when Africa and India did not have permanent land connection with Eurasia (Aitchison et al, 2008;Allen and Armstrong, 2008), and thus an ancestral range consisting of any two of the biogeographic areas would not have been possible; 35-0 mya, after the collision of Africa and India with Eurasia, when an ancestral area consisting of a combination of geographic areas will be possible (see Table A1 for details of the BioGeoBEARS analyses).…”

Section: Phylogenetic Analysismentioning

confidence: 99%

Historical biogeography and phylogeography ofIndoplanorbis exustus

Sil

Mahveen

Roy

et al. 2021

Preprint

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The history of a lineage is intertwined with the history of the landscape it resides in. Here we showcase how the geo-tectonic and climatic evolution in South Asia and surrounding landmasses have shaped the biogeographic history of Indoplanorbis exustus, a tropical Asian, freshwater, pulmonated snail. We amplified partial COI gene fragment from all over India and combined this with a larger dataset from South and Southeast Asia to carry out phylogenetic reconstruction, species delimitation analysis, and population genetic analyses. Two nuclear genes were also amplified from one individual per putative species to carry out divergence dating and ancestral area reconstruction analyses. The results suggest that Indoplanorbis dispersed out of Africa into India during Eocene. Furthermore, molecular data suggests Indoplanorbis is a species complex consisting of multiple putative species. The primary diversification took place in Northern Indian plains or the Northeast India. The speciation events appear to be primarily allopatric caused by a series of aridification events starting from late Miocene to early Pleistocene. None of the species seemed to have any underlying genetic structure suggestive of high vagility. All the species underwent population fluctuations during the Pleistocene likely driven by the Quaternary climatic fluctuations.

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India’s biogeographic history through the eyes of blindsnakes- filling the gaps in the global typhlopoid phylogeny

Cited by 16 publications

References 54 publications

The tangled biogeographic history of tarantulas: An African centre of origin rules out the centrifugal model of speciation

The tangled biogeographic history of tarantulas: An African centre of origin rules out the centrifugal model of speciation

A widespread commensal loses its identity: suggested taxonomic revision for Indotyphlops braminus (Scolecophidia: Typhlopidae) based on molecular data

Historical biogeography and phylogeography ofIndoplanorbis exustus

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