Phylogenetic Relationships of the Earliest Anisostrophyically Coiled Gastropods.

摘要

Phlogenetic Relationships of the Earliest Anisostrophically Coiled Gastropods. Smithsonian Contributions to Paleobiology, number 88, 152 pages, 37 figures, 3 tables, 2002-In order to explore the phylogenetic relationships among early gastropods, cladistic analyses were conducted of nearly 300 'archaeogastropod' species known from the latest Cambrian through the Silurian. The study includes an extended outgroup analysis of Cambrian molluscs The resulting estimates of gastropod phylogeny differ not only from traditional ideas about early gastropod relationships, but also from most alternative notions. This study suggests that two major subclades evolved by the Ordovician. The diagnoses and definitions of these two subclades best correspond to the traditional diagnoses and definitions of the Euomphalina and Murchisoniina. An extensive taxonomic revision is presented, which removes all early Paleozoic taxa from the Pleurotomariina and broadly expands the definitions of the Euomphalina and Murchisoniina.