Figure 2.5:1-3,Genevievella granulatus (Walcott)(USNM 437962);1,dorsal view of articulated exoskeleton,X3.2;2,right-lateral view of dorsal exoskeleton shown in 5.1,X2.8;3,dorsal view of semi-articulated specimen,(FMNH PE57127),X5.8;4-7, Tricrepicephalus texanus (Shumard);4,dorsal view of articulated exoskeleton,partially distorted by calcite-fi lled fracture running diagonally from lower right to upper left of specimen,(USNM 437945),X1.7;5,right-lateral view of dorsal exoskeleton shown in 5.4,X1.8;6,dorsal view of isolated cranidium (FMNH PE),X3.9;7,dorsal view of isolated cranidium (FMNH PE),X1.3;8,Beckwithia typa Resser (FMNH PE57128), dorsal view of head shield,X1.2;9-11,Lingulella sp ;9,bedding plane view of multiple valves,(FMNH PE),X0.5;10,detail of interval valve surface,(FMNH PE57129), X3.6,;11,detail of internal valve surface,(FMNH PE57130),X4.1;12-13,unidentified soft-bodied or lightly scleritized organism,specimens are part and counter-part of same individual;12,(FMNH PE57131),X2.3;13,(FMNH PE57132),X2.3.
Acknowledgements:
Many thanks to Dr. Shanan Peters for his permission to use these unpublished plates of Weeks Formations Trilobites (Shanan Peters, unpubl. dissertation, 2003). As these are unpublished plates, and the sole property of Dr. Peters, permission from the author must be gained in order to reproduce these plates. Please note that these plates are not from the final, peer-reviewed version of the manuscript.
Shanan
E. Peters
University of Michigan
Museum of Paleontology
1109 Geddes Road
Ann Arbor, MI 48109-1063
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Western
Trilobites Association:
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