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Lectotype of Phacops rana milleri Stewart, 1927 (Trilobita, Devonian of Ohio)

Published online by Cambridge University Press:  20 May 2016

Loren E. Babcock
Loren E. Babcock*
Affiliation:
Department of Geological Sciences, 155 South Oval Mall, The Ohio State University, Columbus 43210
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Extract

The trilobite Phacops rana var. milleri Stewart, 1927, was based on five specimens collected from the Silica Shale (Middle Devonian) in a quarry formerly owned by the Sandusky Cement Company, near Silica, Lucas County, Ohio. The “cotypes” (=syntypes of modern terminology) were catalogued as number 16266 in the Orton Geological Museum of The Ohio State University. Study of specimens in the OSU collection reveal four extant syntypes belonging to two subspecies of Phacops rana (Green, 1832). Three complete specimens and one separate eye are represented. A cephalon mentioned by Stewart (1927, p. 59) is missing and presumed lost. Of the extant specimens, three belong to P. rana milleri and one belongs to P. rana crassituberculata Stumm, 1953.

Type
Taxonomic Notes
Information
Journal of Paleontology , Volume 66 , Issue 4 , July 1992 , pp. 692 - 693
Copyright
Copyright © The Paleontological Society 

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References

Babcock, L. E., and Speyer, S. E. 1987. Enrolled trilobites from the Alden Pyrite Bed, Ledyard Shale (Middle Devonian) of western New York. Journal of Paleontology, 61:539–548.Google Scholar
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Green, J. 1832. A Monograph of the Trilobites of North America: With Coloured Models of the Species. Joseph Brano, Philadelphia, 94 p.Google Scholar
Stewart, G. A. 1927. Fauna of the Silica Shale of Lucas County. Geological Survey of Ohio, Fourth Series, Bulletin 32, 76 p.Google Scholar
Stumm, E. C. 1953. Trilobites of the Devonian Traverse Group of Michigan. Contributions from the Museum of Paleontology, University of Michigan, 10:101–157.Google Scholar