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Gluteus minimus (fossil) : ウィキペディア英語版 | Gluteus minimus (fossil)
''Gluteus minimus'' is a fossil from the Upper Devonian of Iowa. It was first collected in 1902, but only described in 1975. Each animal appears as a bi-lobed lens up to , and almost all specimens share the same slight asymmetry. The species is of uncertain affinities, having been thought of as either a fish tooth or a brachiopod. ==Collection history== Specimens of ''G. minimus'' were first collected by Stuart Weller in 1902, from the Maple Mill Shale near Maple Mill on the English River, Washington County, Iowa. The Upper Devonian Maple Mill Shale appears as a series of shale lenses which are rich in fossils, including conodonts, fish remains, possible sporocarps, gastropods, brachiopods, bivalves and scolecodonts. At a similar time to Weller's collections, Charles Rochester Eastman collected specimens from the Kinderhook Beds at Burlington, Des Moines County, Iowa.〔 C. H. Belanski collected specimens thirty years later from the Lime Creek Formation in Floyd County, Iowa.〔 Thousands of specimens have since been collected from the Maple Mill Shale and nearby sites, and two have been found in a well at Columbus City, Louisa County, Iowa.〔
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