File:Gravicalymene abbreviata fossil trilobite (Kope Formation, Upper Ordovician; Rt. 62-Rt. 68 roadcut, eastern side of Ripley, southern Brown County, southwestern Ohio, USA) (15082387710).jpg
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Gravicalymene abbreviata fossil trilobite (3.8 cm long) from gray mudshales of the Kope Formation (Edenian Stage, lower Cincinnatian Series, Upper Ordovician) of southern Brown County, Ohio, USA. Gravicalymene abbreviata (Foerste, 1910) is a distinctively granulose calymenid trilobite commonly found in fossiliferous limestones and shales of the lower Cincinnatian Series of southwestern Ohio, southeastern Indiana, and northern Kentucky, USA It is frequently misidentified as the nominal species Flexicalymene granulosa, even by professional trilobitologists. Gravicalymene abbreviata is reminiscent of a granulose Flexicalymene, but several consistent characters indicate assignment to a calymenid genus other than Flexicalymene. The specimen below is a complete Gravicalymene abbreviata from shales of the Kope Formation in southern Brown County, Ohio. This species differs from species assigned to Flexicalymene in subtle, but meaningful, ways (see Brandt, 1980 for more info.): 1) bell-shaped glabella (vs. a tapering forward glabella with sublinear border furrows in Flexicalymene) 2) relatively wider (tr.) thoracic axial lobe 3) different configuration of lateral glabellar furrows (especially the S1 furrows, which are directed anterolaterally; in Flexicalymene, they are strongly directed laterally, but bowed forward (convex anteriorly)) 4) relatively smaller palpebral lobes & smaller eyes Confusing the situation further, at least one other granulose calymenid species appears to be present in the Cincinnatian. It sometimes co-occurs with Gravicalymene abbreviata. Locality: roadcut on southern side of Rt. 62/68, eastern side of Ripley, southern Brown County, southwestern Ohio, USA (38° 44' 36.34" North, 83° 50' 20.69" West). Reference cited: Brandt, D.S. 1980. Phenotypic Variation and Paleoecology of Flexicalymene [Arthropoda: Trilobita] in the Cincinnatian Serires (Upper Ordovician) near Cincinnati, Ohio. M.S. thesis. University of Cincinnati. 178 pp. |
| Date | |
| Source | Gravicalymene abbreviata fossil trilobite (Kope Formation, Upper Ordovician; Rt. 62-Rt. 68 roadcut, eastern side of Ripley, southern Brown County, southwestern Ohio, USA) |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15082387710. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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