Retrorsirostra
Classification
Phylum: Brachiopoda
Class: Rhynchonellata
Order: Orthida
Family: Plaesiomyidae
Genus: Retrorsirostra Schuchert & Cooper, 1931
Cincinnatian Species: Retrosirostra carleyi
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Geologic Range
Late Ordovician (Ashgill)
Common Paleoecology
Retrorsirostra is an extinct genus of stationary epifaunal suspension feeders
Identification in Hand Sample:
- Epipunctae large, usually about eight per rib
- Subparallel dental plates
- Nearly straight commissure
- Coarse and densely spaced ribs
Geographic Occurrences
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Jin, Zhan, Copper, and Caldwell (2007) :
- Within the plaesiomyids, the epipunctae in Retrorsirostra and Plaesiomys are similarly large, usually with fewer than eight per rib along a growth line. In comparison, the epipunctae of Dinorthis occidentalis are more numerous and more densely spaced, reaching over 20 per rib along a growth line.
Treatise on Invertebrate Paleontology, Part H, Vol. 3 (2000):
- Similar to Plaesiomys but rectimarginate, coarsely costellate, and filate; procline ventral interarea long, planar, orthocline dorsal interarea short, curved; dental plates projecting subparallel, ventral muscle scar impressed on low callus with median ridge
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R. carleyi
