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Showing results for tags 'pleurocystites'.
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From the album: Oklahoma Paleozoic Fossil Finds
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- cystoid
- echinoderm
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Synonym: Pleurocystites robustus Billings, 1854. Alternative spelling: Pleurocystis. Taxonomy from fossilworks.org. Diagnosis (Sprinkle et al., 1985): “Theca rounded-triangular, nearly symmetrical; 3 rhombs elliptical, dichopores occupying less than 40% of sutures; periproct occupying 70% of lower side, about 680-700 periproctals, no rectal lobe, anal pyramid away from margin; ornament composed of medium growth lines and few ridges radiating to the plate sides and corners; brachioles having large groove extending up aboral side, cover plates fairly large; proximal stem slowly tapering and moderately ridged.” ID determined by oilshale. Reference: Billings, E. (1874). Paleozoic Fossils, v. II, pt. I. Canada Geological Survey 1-144 Parsley, R. L. (1970). Revision of the North American Pleurocystitidae (Rhombifera-Cystoidea). Bulletins of American Paleontology 58:135-213. Sprinkle, J., Henry, L., Zimmer, F., Kelley, L., & Whiteley, J. (1985). New Pleurocystites from the Bromide Formation of Oklahoma. Journal of Paleontology, 59(6), 1476-1480. Brower, J. (1996). Growth and Functional Morphology of Pleurocystites Squamosus Billings, An Ordovician Rhombiferan Echinoderm. The Paleontological Society Special Publications, 8, 48-48. doi:10.1017/S2475262200000502 Paton, T. (2017). Paleo Pompeii; Genesis and Preservation of an Upper Ordovician Mounded Hardground with a Diverse Encrusting Community. Master-thesis, University of Cincinnaty. Paton, T. and Brett, C. E. (2019). Revised stratigraphy of the middle Simcoe Group (Ordovician, upper Sandbian-Katian) in its type area: An integrated approach. Canadian Journal of Earth Sciences 57(1).
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- ontario
- ordovician
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From the album: Echinoderm Collection
Pleurocystites squamosus (Parseley, 1982 (?)), Amecystis laevis (Raymond, 1921). There are at least 10 specimens of cystoids here, 6 Amecystis leavis and 4 Pleurocystites squamosus. The cystoids are either complete or partials. Upper Bobcaygeon Formation, Middle Ordovician. James Dick Quarry, Gamebridge, Simcoe County, Ontario, Canada. Piece is 21 cm in length and 18 cm tall.- 2 comments
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- simcoe county
- ontario
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From the album: Invertebrates
Pleurocystites squamosus Billings, 1874 Ordovician Bobcaygeon Formation Brechin Carden Ontario Canada- 2 comments
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- pleurocystites
- bobcaygeon
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