2010 GSA Denver Annual Meeting (31 October 3 November 2010)
Paper No. 32-17
Presentation Time: 8:00 AM-6:00 PM


WRIGHT, David F., School of Earth Sciences, Ohio State University, 275 Mendenhall Laboratory, 125 South Oval Mall, Columbus, OH 43210, wright.1433@osu.edu and SELDEN, Paul A., Paleontological Institute, University of Kansas, 1475 Jayhawk Blvd, Lindley Hall, Rm 120, Lawrence, KS 66045

Trigonotarbids form a diverse order of extinct terrestrial Paleozoic arachnids. Superficially resembling spiders, trigonotarbids lack spinnerets and other autapomorphies of Araneae. Although trigonotarbids are common arachnids in Carboniferous coal deposits throughout the world, arachnids are uncommon fossils, making any occurrence a notable contribution to their record and worthy of description. The family Anthracomartidae, Haase, 1890, is comprised of trigonotarbids having opisthosomal tergites divided into five plates, while all other trigonotarbids have three. Two trigonotarbid arachnids are described from the Upper Pennsylvanian (Virgilian) of Kansas. Both specimens are referred to Anthracomartus sp., Karsch, 1882, the type genus of Anthracomartidae. Hesitation in diagnosing to the species level is a result of recent work on the family suggesting a revision is necessary, with many genera synonymized. This marks the first occurrence of trigonotarbids in Kansas, increasing the number of fossil arachnid orders known from the state.

2010 GSA Denver Annual Meeting (31 October 3 November 2010)
General Information for this Meeting
Session No. 32--Booth# 100
Paleontology (Posters) I - Morphology and Biotic Interactions
Colorado Convention Center: Hall D
8:00 AM-6:00 PM, Sunday, 31 October 2010

Geological Society of America Abstracts with Programs, Vol. 42, No. 5, p. 97

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