Phylogeny and conservation status of the Indian egg-eater snake, Elachistodon westermanni Reinhardt, 1863 (Serpentes, Colubridae): Supplementary material
Ashwini Venkatanarayana Mohan
Avinash C. Visvanathan
Karthikeyan Vasudevan
10.6084/m9.figshare.6322940.v3
https://brill.figshare.com/articles/journal_contribution/Phylogeny_and_conservation_status_of_the_Indian_egg-eater_snake_Elachistodon_westermanni_Reinhardt_1863_Serpentes_Colubridae_Supplementary_material/6322940
The Indian egg-eater (<i>Elachistodon westermanni</i>) is a monotypic species of the Genus <i>Elachistodon</i> distributed across the
Indian sub-continent. In Africa, there are 13 species of egg-eating snakes of
the Genus <i>Dasypeltis</i>. These two
genera, <i>Elachistodon </i>and <i>Dasypeltis</i> were thought to be closely
related due to similar diet specialization, and shared biogeographic history between
the Indian sub-continent and the continent of Africa. In our study, we amplified
three mitochondrial genes and one nuclear gene from <i>E. westermanni</i> and reconstructed molecular phylogeny utilizing
published sequences to understand the evolutionary relationships between the
African, and the Indian egg-eating snakes. We used morphological characters to
reinforce our inferences on phylogenetic relationships. We show that the Indian
egg-eater is sister to a set of cat snakes of the Genus <i>Boiga</i>,<i> </i>and it does not
share recent ancestry with the African egg-eating snakes. Morphological
character states point at similarities between <i>Elachistodon </i>and<i> Dasypeltis</i>
only in characters associated with their feeding behaviour. <i>Elachistodon</i> <i>westermanni</i> was similar to the <i>Boiga
</i>spp<i>.</i> in several other morphological
characters, and we provisionally assign <i>E.
westermanni</i> under the genus <i>Boiga</i>.
Compilation of records of <i>E. westermanni</i>
across the Indian sub-continent over the years revealed a positive
"Lazarus" effect. We conclude that, the egg-eating behaviour and the associated
morphological characters in the snake genera <i>Dasypeltis</i> and <i>Elachistodon </i>are
a result of convergent evolution. Based on the conservation
status of <i>E. westermanni</i>, it could
serve as a flagship species to conserve important wildlife habitats that are
being lost rapidly in India.
2018-05-28 08:56:29
Boiga
convergent evolution
dietary niche
conservation
Morphology comparisons
oophagy
taxonomy
Phylogeny and Comparative Analysis