Wall structure and evolution in cyclostomate Bryozoa

Publisher Website
Google Scholar
Abstract
The Stenolaemata comprise both basically single-walled forms (Cyclostomata) and double-walled forms (Trepostomata, Cystoporata and Cryptostomata) from their 1st appearance in the geological record. At the end of the Paleozoic the main groups of apparently double-walled stenolaemates died out, and only the single-walled cyclostomates survived. During the Mesozoic, evolution within the Stenolaemata was apparently repeated by the further development of double-walled forms such as cerioporids, lichenoporids and cancelloids, from single-walled ancestors. These double-walled groups are all remarkable homeomorphs of the major Paleozoic groups of Bryozoa. A monophyletic origin of the post-Paleozoic Cyclostomata from Paleozoic single-walled forms is suggested.

This publication has 3 references indexed in Scilit: