Edited by oilshale
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Periarchus sp.
Images: 
By sixgill pete (edited)
Taxonomy
Sand Dollar
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Order: Clypeasteroida
Family: Protoscutellidae
Genus: Periarchus
Species: Periarchus sp.
Author Citation Conrad, 1866
Geological Time Scale
Eon: Phanerozoic
Era: Cenozoic
Period: Paleogene
Sub Period: None
Epoch: Eocene
International Age: Bartonian
Stratigraphy
Castle Hayne Formation
Provenance
Collector: Don Rideout
Date Collected: 03/18/2016
Acquired by: Field Collection
Dimensions
Length: 30 mm
Width: 28.2 mm
Thickness: 5.1 mm
Location
Martin Marietta Quarry
Onslow County
North Carilina
United States
Comments
Periarchus sp. is found in Zullo & Harris (1987) sequence 3 of the Castle Hayne Formation ( Kier, (1980) middle biozone). It is differentiated from Periarchus lyelli only by the placement of the periproct. In P. sp the periproct is below the midpoint between the peristome and the posterior margin of the test. On P. lyelli it is slightly above. Kier (1980), identified this sand dollar as Protoscutella plana; however Osborne, Mooi and Ciampaglio (2013) determined the oral plate structure separate these specimens from Protescutella plana and belonged in the Genus Periarchus.
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