Peridermal and interthecal tissue in Silurian retiolitid graptolites: with examples from Sweden and Arctic Canada
- 1 October 1987
- journal article
- research article
- Published by Scandinavian University Press / Universitetsforlaget AS in Lethaia
- Vol. 20 (4) , 353-359
- https://doi.org/10.1111/j.1502-3931.1987.tb00795.x
Abstract
Peridermal tissue, and thecal ''floors'' are shown to be present in some specimens of Pseudoretiolites, Retiolites and Stomatograptus. The development of a dense reticulum and thecal hoods is also recognized as being a progressive developmental feature in Gothograptus. It is suggested that all these structures, whether internal or external, are the product of mature or old-age development. It appears questionable whether the Rhabdopleural model of rhabdosomal developmental adequately explains late-stage membranes and other adventitious tissues such as discussed herein.This publication has 2 references indexed in Scilit:
- Silurian retiolitids from the Cape Phillips Formation, Arctic Islands, CanadaBulletin of the Geological Society of Denmark, 1987
- The fine structure of the virgular apparatus in Cystograptus vesiculosusLethaia, 1982