Silicified Lichidae (Trilobita) from the Middle Ordovician of Virginia

Autor:	W. R. Evitt, R. P. Tripp
Rok vydání:	1981
Předmět:	Paleontology biology Ordovician Geology Subspecies biology.organism_classification Devonian Bulla (gastropod) Trilobite
Zdroj:	Geological Magazine. 118:665-677
ISSN:	1469-5081 0016-7568
DOI:	10.1017/s0016756800033872
Popis:	SummaryThe trilobite family Lichidae is represented in the Middle Ordovician of Virginia by silicified remains of species of Hemiarges and Amphilichas. One new subspecies, Hemiarges turneri Chatterton & Ludvigsen rasettii, is described. Development stages of both genera are illustrated. The bulla of H. turneri rasettii appears in the meraspis, whereas it is present in the protaspis of a Devonian species. The late metaprotaspis of Amphilichas has a small fixigenal spine, a feature shared with protaspides of the family Odontopleuridae.
Databáze:	OpenAIRE
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