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Silurian Gastropoda from southeastern and west-central Alaska

Published online by Cambridge University Press:  20 May 2016

David M. Rohr ,
Robert B. Blodgett  and
Jiří Frýda
David M. Rohr
Affiliation:
1Department of Earth and Physical Sciences, Sul Ross State University, Alpine, Texas 79832, USA,
Robert B. Blodgett
Affiliation:
2U.S. Geological Survey—Contractor, 4200 University Drive, Anchorage, Alaska 99508, USA,
Jiří Frýda
Affiliation:
3Czech Geological Survey, Klárov 3, 118 21 Praha 1, Czech Republic,
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Abstract

Additional Silurian (Ludlovian) gastropods are described from the Heceta Formation in the Alexander terrane on Prince of Wales Island, southeastern Alaska. Species include Spinicharybdis krizi n. sp., Spinicharybdis boucoti n. sp., Morania wagneri n. sp., Haplospira craigi n. sp., Australonema sp., Pachystrophia cf. gotlandica (Lindström, 1884), and Medfrazyga gilmulli n. sp. An additional new Silurian species, Morania nixonforkensis n. sp., is described from the Nixon Fork subterrane of the Farewell terrane of west-central Alaska.

The spine-bearing Spinicharybdis is placed into a new subfamily Spinicharybdiinae together with Hystricoceras Jahn, 1894. Joint occurrences of genera Beraunia, Coelocaulus, and Morania, as well as members of subfamily Spinicharybdiinae in the gastropod fauna from the Heceta Formation, support its close relationship with gastropod fauna of Bohemia. Additionally, the occurrence of the genus Medfrazyga suggests a faunal link between the Alexander and Farewell terranes of Alaska. Medfrazyga gilmulli n. sp. is the oldest known and the only early Paleozoic member of the family Palaeozygopleuridae.

Type
Research Article
Information
Journal of Paleontology , Volume 82 , Issue 3 , May 2008 , pp. 604 - 611
Copyright
Copyright © The Paleontological Society 

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