On the position of Cambrian archaeobranchians in the system of the class Gastropoda

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,...

Full description

Saved in:
Bibliographic Details
Published in:Paleontological journal 2017-09, Vol.51 (5), p.453-463
Main Author: Parkhaev, P. Yu
Format: Article
Language:English
Subjects:
Analysis
Body organs
Cambrian
Earth and Environmental Science
Earth Sciences
Mantle
Marine molluscs
Miniaturization
Mollusks
Muscles
Organs
Paleontology
Phylogeny
Taxa
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0031-0301
1555-6174
DOI:10.1134/S0031030117050070