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Calicovatellus petrodytes, a new genus and species of primitive vatelline diving beetle (Coleoptera: Dytiscidae: Hydroporinae: Vatellini) from the Miocene Barstow Formation, southern California, USA

Published online by Cambridge University Press:  20 May 2016

Kelly B. Miller  and
Sara H. Lubkin
Kelly B. Miller
Affiliation:
Department of Entomology, Comstock Hall, Cornell University, Ithaca, NY 14853, USA,
Sara H. Lubkin
Affiliation:
Department of Geological Sciences, Snee Hall, Cornell University, Ithaca, NY 14853, USA,
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Extract

Relatively few fossil dytiscids have been described. This is unfortunate since fossils can provide useful phylogenetic and evolutionary information including unique character combinations not present in extant taxa and minimum ages for divergences. However, even when fossils are found, important characters are often not visible since they may be poorly preserved or obscured. The fossil insects present in calcareous nodules from the Miocene Barstow Formation of the Calico Mountains in Southern California are exceptionally well preserved (Palmer, 1957). The original organisms are replaced by silica or other minerals and when the nodules are dissolved in formic acid, the three-dimensional fossil can be retrieved from the resulting residue. These nodules have yielded a wide variety of fossils, including larvae of the dytiscid species Schistomerus californense Palmer, 1957 and numerous other terrestrial and fresh-water arthropods (Palmer, 1957). The purposes of this paper are to describe a new dytiscid genus and species from an exceptionally well-preserved specimen from the Barstow Formation and to present a hypothesis of the phylogenetic placement of the new taxon.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 75 , Issue 4 , July 2001 , pp. 890 - 894
Copyright
Copyright © The Paleontological Society

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