THE FOSSIL DIATOM GENUSTRUANIAPANTOCSEK AND ITS RELATIONSHIP WITHELLERBECKIACRAWFORD

Autor:	Patricia A. Sims, Richard M Crawford
Rok vydání:	2007
Předmět:	Paleontology Ellerbeckia Diatom Taxon biology Genus Stage (stratigraphy) Ecology Aquatic Science biology.organism_classification Mantle (geology) Cretaceous
Zdroj:	Diatom Research. 22:197-207
ISSN:	2159-8347 0269-249X
DOI:	10.1080/0269249x.2007.9705704
Popis:	The rare taxon, Truania archangelskiana Pantocsek has been examined from slides and material in the Natural History Museum, London, and from slides in the Hustedt Collection, Bremerhaven, all of it Russian. This marine fossil from the Late Cretaceous and Palaeocene shows strong similarities with species of Ellerbeckia Crawford with which it shares the characteristic mantle edge, valvocopula and mantle structure but differs in not having the linking valve/separation valve heterovalvy. It probably existed as single cells because cameo and intaglio features occur on both sibling valves. The tube processes are enigmatic and may indicate a stage of evolution before the porelliportula characteristic of Ellerbeckia. Preliminary remarks regarding family relationships are made.
Databáze:	OpenAIRE
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