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Degree

MS, Kent State University, College of Arts and Sciences / Department of Geology, 2008.

Abstract

Jurassic galatheoids have long been underrepresented in the literature, so theirexplosive diversification during the Late Jurassic has only recently become apparent. However, critical early stages of this explosive radiation are well represented in the extensive mid-20th century collections made by Friedrich Bachmayer, from from five quarries in the Ernstbrunn Limestone, from around Ernstbrunn, Austria. The Naturhistorische Museum of Vienna, Austria, recently made the Friedrich Bachmayer decapod collection available for study. During the summers of 2006 and 2007, over 250 galatheoids from the superfamily Galatheiodea Samouelle, 1819, were borrowed from the extensive collection, of which more than 170 were studied for this thesis. The remaining galatheoids, as well as additional ones borrowed during the summer of 2008, will be studied in a future work. Galatheoids that were either never studied before or previously had been assigned solely to the genus Gastrosacus von Meyer, 1851, were found to be diverse enough to form a new family, with 8 new genera, and 22 new species. In addition to the new species, three previously identified species were studied: Gastrosacus eminens (Blaschke, 1911), Gastrosacus ernstbrunnensis Bachmayer, 1947, and previously synonymized Galathea acutirostris Moericke, 1889, now placed within a new genus. The galatheoids that belong to this new family have a distinctive groove structure with extensive regional definition and strong ornamentation. A standard terminology for these galatheoids is enumerated within this work in order to simplify the diagnoses and descriptions.

Subject Headings

Geology; Paleontology

Keywords

galatheoids, galatheids, Gastrosacus; Ernstbrunn, Austria; systematics

Committee / Advisors

Rodney Feldmann, PhD (Advisor)
Carrie Schweitzer, PhD (Committee Member)
Neil Wells, PhD (Committee Member)

Pages

164p.

Document number: kent1219175564
Permalink: http://rave.ohiolink.edu/etdc/view?acc_num=kent1219175564

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