<p>Ellobiidae is a family of primitive pulmonate gastropods that occupy transitional environments between ocean and land, playing a key role in the ecological and evolutionary history of land colonization by gastropods. However, the phylogenetic relationships within Ellobiidae remain controversial. In this study, we sequenced 13 complete mitochondrial genomes from 11 Ellobiidae species (10 newly sequenced) and reconstructed their phylogeny using maximum likelihood (ML) and Bayesian inference (BI) methods. Our results confirm that Ellobiidae is divided into two main clades: the PEC clade, including Pythiinae, Ellobiinae, and Carychiinae, and the MP clade, including Melampodinae and Pedipedinae. We found that Pythiinae is sister to Ellobiinae, and propose that genus <i>Auriculastra</i> should be classified into Ellobiinae. Melampodinae are monophyletic, and Pedipedinae likely is its sister group. Furthermore, Melampodinae may follow an independent evolutionary trajectory, as suggested by distinct mitochondrial genome features. We also recorded four undetermined species, highlighting the need for increased sampling in future research on Ellobiidae.</p>

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Phylogenetic Relationships Within Ellobiidae (Gastropoda: Eupulmonata) Based on Complete Mitochondrial Genomes: New Insights and Taxonomic Implications

  • Shaowen Han,
  • Xiao Han,
  • Jihang Gong,
  • Tao Xu,
  • Lingfeng Kong

摘要

Ellobiidae is a family of primitive pulmonate gastropods that occupy transitional environments between ocean and land, playing a key role in the ecological and evolutionary history of land colonization by gastropods. However, the phylogenetic relationships within Ellobiidae remain controversial. In this study, we sequenced 13 complete mitochondrial genomes from 11 Ellobiidae species (10 newly sequenced) and reconstructed their phylogeny using maximum likelihood (ML) and Bayesian inference (BI) methods. Our results confirm that Ellobiidae is divided into two main clades: the PEC clade, including Pythiinae, Ellobiinae, and Carychiinae, and the MP clade, including Melampodinae and Pedipedinae. We found that Pythiinae is sister to Ellobiinae, and propose that genus Auriculastra should be classified into Ellobiinae. Melampodinae are monophyletic, and Pedipedinae likely is its sister group. Furthermore, Melampodinae may follow an independent evolutionary trajectory, as suggested by distinct mitochondrial genome features. We also recorded four undetermined species, highlighting the need for increased sampling in future research on Ellobiidae.