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Shelled opisthobranchs.

Paula M Mikkelsen1

  • 1Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192, USA. mikkel@amnh.org

Advances in Marine Biology
|July 4, 2002
PubMed
Summary
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Shelled opisthobranchs, historically termed "tectibranchs," are crucial for understanding gastropod evolution. This review clarifies their taxonomy and phylogenetic importance using anatomical and molecular data.

Area of Science:

  • Marine Biology
  • Evolutionary Biology
  • Malacology

Background:

  • Historically, the subgroup Tectibranchiata encompassed shelled opisthobranch snails, including Cephalaspidea, Anaspidea, and shelled Notaspidea and Sacoglossa.
  • Pilsbry considered tectibranchs the ancestral stock for advanced gastropods like Nudibranchia and Pulmonata.
  • Tectibranch systematics relied on conchology, but soft-anatomical characters are vital due to shell reduction and evolutionary proximity to unshelled gastropods.

Purpose of the Study:

  • To review the history, current taxonomic status, and presumed synapomorphies of shelled opisthobranchs.
  • To emphasize the importance of anatomical data in understanding these transitional gastropod forms.
  • To present a synthetic phylogenetic analysis based on existing data to clarify evolutionary relationships.

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Main Methods:

  • Review of historical contributions, particularly Pilsbry's work on Tectibranchiata.
  • Analysis of both conchological and soft-anatomical characters.
  • Synthetic phylogenetic analysis integrating data from four published phylogenies.

Main Results:

  • Tectibranchiata is not currently recognized as a natural taxon; shelled opisthobranchs have been redistributed.
  • Opisthobranchia, Cephalaspidea, and Sacoglossa are confirmed as monophyletic taxa.
  • Acteon is identified as a lower heterobranch, not a basal opisthobranch; Anaspidea groups with Cephalaspidea, and Notaspidea (pleurobranchoidean) with Nudibranchia (Nudipleura).

Conclusions:

  • Despite polyphyly, shelled opisthobranchs are vital for evolutionary studies as basal members of clades exhibiting mosaic primitive and derived features.
  • Anatomical data is critical for understanding these transitional forms.
  • The phylogenetic analysis provides a current understanding of shelled opisthobranch relationships and highlights areas for future research.