CYLINDROSPIRA, A NEW DIATOM GENUS FROM THE PALAEOGENE OF DENMARK WITH PALAEOECOLOGICAL SIGNIFICANCE

Autor:	Alexander G. Mitlehner
Rok vydání:	1995
Předmět:	Palynology Type species Paleontology Diatom biology Ecology Genus Gladius Aquatic Science biology.organism_classification Paleogene Fur Formation Cretaceous
Zdroj:	Diatom Research. 10:321-331
ISSN:	2159-8347 0269-249X
DOI:	10.1080/0269249x.1995.9705352
Popis:	A new diatom genus, Cylindrospira is described from the Fur Formation, an Upper Palaeocene to Lowermost Eocene ash-bearing diatomite from North Denmark long renowned for its rich and diverse fossil flora. Two forms have been found, the largest of which, Cylindrospira simsi is designated here as the type species. SEM observations reveal that the structure of this and the smaller forma, homarmi, have broad similarities with the Cretaceous genus Gladius, the Mid Eocene-Oligocene genus Pyxilla, the Late Eocene—Recent genera Aidacoseira and Melosira, and the Cretaceous-Recent genus Hemiaulus, but have sufficient dissimilarities from these to warrant the erection of a new genus. Associated palynological and sedimentological evidence suggest a brackish, probably lagoonal palaeoenvironment. To date, only fully marine diatoms have been recorded from the Palaeocene.
Databáze:	OpenAIRE
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