Journal
PALEONTOLOGICAL JOURNAL
Volume 51, Issue 5, Pages 453-463Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0031030117050070
Keywords
mollusks; gastropods; Archaeobranchia; systematics; phylogeny; morphology; shell muscles; Cambrian
Categories
Funding
- Russian Foundation for Basic Researches [16-05-00651]
- Presidium of the Russian Academy of Sciences [I.32P]
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Possible phylogenetic relationships of the Cambrian gastropod subclass Archaeobranchia with other high-rank taxa of the Golikov-Starobogatov's gastropod macrosystem are reconstructed. Archaeobranchians can be direct or indirect ancestors to five extant subclasses, i.e., Cyclobranchia, Scutibranchia, Pectinibranchia, Divasibranchia, and Dextrobranchia. Three euthyneural subclasses (Sinistrobranchia, Opistobranchia, and Pulmonata) are later descendants of Divasibranchia. The model for transformation of the shell muscles arrangement reconstructed previously for the Cambrian cap-shaped mollusks, towards the muscle system of modern cyclobranchians is proposed. The evolution of Cyclobranchia through the miniaturization stage can explain reduction of the right portion of organs in the mantle complex.
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