期刊
PALEONTOLOGICAL JOURNAL
卷 51, 期 5, 页码 453-463出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S0031030117050070
关键词
mollusks; gastropods; Archaeobranchia; systematics; phylogeny; morphology; shell muscles; Cambrian
类别
资金
- Russian Foundation for Basic Researches [16-05-00651]
- Presidium of the Russian Academy of Sciences [I.32P]
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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