Virgellar meshworks and sicular spinosity in Llandovery graptoloids

Autor:	R. B. Rickards, T. N. Koren
Rok vydání:	1974
Předmět:	Paleontology biology Virgella Geology biology.organism_classification
Zdroj:	Geological Magazine. 111:193-204
ISSN:	1469-5081 0016-7568
Popis:	SummaryOrthograptus obuti sp.nov. and Orthograptus insectiformis Nicholson are shown to exhibit a complex proximal meshwork developed from a much-divided virgella which closely resembles retiolitid clathrial and lacinial networks. The virgellar meshworks tend to enclose the rhabdosome, at least for the first few thecal pairs, and may support a tenuous periderm. This kind of virgellar complexity is contrasted with a newly discovered form of sicular spinosity represented by the species Glyptograptus (Pseudoglyptograptus) tabukensis sp.nov. and G. (P.) rhayaderensis sp.nov
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1c5753784fcdb73b5576c781f3600602 https://doi.org/10.1017/s0016756800038437 Zobrazit plný text záznamu