Silicified trilobites of the family Asaphidae from the Middle Ordovician of Virginia

Volume / Part: 29 / 4
Publication Date: December 1986
Page(s): 705 - 724
Authored By: R. P. Tripp and W. R. Evitt

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Protaspis, meraspis, and holaspis stages of Isotelus giselae sp. nov. from the Edinburg Formation (Middle Ordovician) of Virginia are described; diagnostic features of the dorsal shield are the absence of a distinct lateral depression, and the short, strongly elevated palpebral lobes. Four moults during the protaspis period are denned by changes in the hypostomes. Iotelus spp. A-E, from the lower and upper Lincolnshire, Oranda, and Martinsburg Formations (Middle Ordovician) of Virginia are based on less complete material. Nahannia sp. is described from the Lincolnshire Formation.

Palaeontology - Volume 29 Part 4 Pages 705-724

Palaeontology - Volume 29 Part 4 Pages 705-724

Citations

TRIPP, R. P., EVITT, W. R. 1986. Silicified trilobites of the family Asaphidae from the Middle Ordovician of Virginia. Palaeontology, 29, 4, 705–724.