Search the Community
Showing results for tags 'pleurocystites'.
Found 5 results
-
-Copy.JPG.eafccbc1ab5db5ff9595f9a562974d49.JPG)
From the album: Oklahoma Paleozoic Fossil Finds
-
- 2
-
-
- cystoid
- echinoderm
- (and 3 more)
-
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).
-
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
-
- 1
-
-
- cystoids
- gamebridge
- (and 4 more)
-
From the album: Invertebrates
Pleurocystites squamosus Billings, 1874 Ordovician Bobcaygeon Formation Brechin Carden Ontario Canada- 2 comments
-
- 1
-
-
- bobcaygeon
- brechin
- (and 3 more)
-
Sometimes you get a very pleasant surprise when you get your finds home and start prepping. I was very fortunate to find two relatively complete Amecystis laevis this Saturday October 31, 2015 up at the JD Quarry near Lake Simcoe, Ontario , Canada. They most likely came out of the very top part of the BobCaygeon formation as they were both found in a recently created pile and not in situ. If not it was from the very bottom of the Verulam This picture because of the lighting used came out a bit blue. I am not the best photographer around. The specimen is on an 85mm * 66mm matrix and is 79 mm long from tip of arm to tip of tail (about 3.1 inches) . The theca on the amecystis is 17mm wide by 22 mm long. The Amecystis is a dorsal orientation. The edrio is approximately 6 mm in diameter. I believe this to be a Amecytis laevis (Raymond) by the way Thanks for the correction Kevin (Northern Sharks) there are definitely no pore rhombohedrons on this specimen. It is a shame that the Amecystis and the edrio both have some slight damage to them from the quarry blasting. But they are still very good specimens. The amecystis is fairly well inflated and nicely colored. Here is a better picture showing the true coloring. But to my surprise it has a very nice attached travelling companion in a edrioasteroid which I believe to be an Isorophusella incondita. What makes this super interesting and probably quite rare is the fact that the edrio is attached to the amecystis and may well have been there when the amecystis was alive. I wonder if anyone else has ever come across this particular association. Edrios are often found attached to brachiopods in this locality. This was prepped using 40 micron dolomite under a zoom scope at 22 PSI using a Comco .018 high precision nozzle on a Comco air abrasion unit.
.thumb.jpg.51c371f10936bbc883322324e44cc518.jpg)
-Copy.JPG.eafccbc1ab5db5ff9595f9a562974d49.JPG)
