Crawling through time: Transition of snails to slugs dating back to the Paleozoic, based on mitochondrial phylogenomics

Mónica Medina, Shruti Lal, Yvonne Vallès, Tori L. Takaoka, Benoît A. Dayrat, Jeffrey L. Boore, Terrence Gosliner

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Sea slugs (Gastropoda: Opisthobranchia) are characterized by extensive morphological homoplasy. In particular, reduced or absent shells are predominant throughout the group. This trend towards shell loss has resulted in a poor fossil record. DNA-based phylogenies have been helpful in improving our understanding of the evolution of this group and major clades are emerging. We report 13 new complete opisthobranch mitochondrial genomes that provide robust support for some of these emerging nodes. We name three new clades within the Opisthobranchia, the Actopleura (Acteonoidea plus Nudipleura), Placoesophaga (Cephalaspidea plus Anaspidea), and Siphoglossa (Sacoglossa plus the Siphonaria). Finally we use molecular clock dating that suggests an earlier opisthobranch divergence than previously reported. The implications of this evolutionary scenario are discussed.

Original languageEnglish (US)
Pages (from-to)51-59
Number of pages9
JournalMarine Genomics
Volume4
Issue number1
DOIs
StatePublished - Mar 1 2011

All Science Journal Classification (ASJC) codes

  • Aquatic Science
  • Genetics

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