Middle Cambrian arthropods from Utah
- 1 March 2008
- journal article
- Published by Cambridge University Press (CUP) in Journal of Paleontology
- Vol. 82 (2) , 238-254
- https://doi.org/10.1666/06-086.1
Abstract
The Middle Cambrian Spence Shale Member (Langston Formation) and Wheeler and Marjum Formations of Utah are known to contain a diverse soft-bodied fauna, but important new paleontological material continues to be uncovered from these strata. New specimens of anomalocaridids include the largest and smallest near complete examples yet reported from Utah. New material of stem group arthropods includes two new genera and species of arachnomorphs:Nettapezoura basilikaandDicranocaris guntherorum.Other new arachnomorph material includes a new species ofLeanchoiliacomparable toL. protogoniaSimonetta, 1970;Leanchoilia superlata?Walcott, 1912;SidneyiaWalcott, 1911a; andMollisonia symmetricaWalcott, 1912.L. protogoniafrom the Burgess Shale is confirmed as a separate species and is not a composite fossil. The first example of the trilobiteElrathia kingiipreserving traces of the appendages is described. In addition, new material of the bivalved arthropodsCanadaspisNovozhilov in Orlov, 1960;BranchiocarisBriggs, 1976;WaptiaWalcott, 1912; andIsoxysWalcott, 1890 is described.Keywords
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