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Atrypa oklahomensis Brachiopod a.jpg

Dpaul7

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Atrypa oklahomensis Brachiopod
 
Bois d'Arc Formation (overlays the Haragan) of Oklahoma
TIME PERIOD: Lower Devonian (359-383 Million Years Ago)
Atrypa is a genus of brachiopod with shells round to short egg-shaped, covered with many fine radial ridges (or costae), that split further out and growthlines perpendicular to the costae and 2-3 times wider spaced. The pedunculate valve is a little convex, but tends to level out or even become slightly concave toward the anterior margin (that is: opposite hinge and pedicle). The brachial valve is highly convex. There is no interarea (that is a flat area bordering the hinge line approximately perpendicular with the rest of the valve) in either valve. Atrypa was a cosmopolitan and occurred from the late Lower Silurian (Telychian) to the early Upper Devonian (Frasnian). Other sources expand the range from the Late Ordovician to Carboniferous, approximately from 449 to 336 Ma. A proposed new species, A. harrisi, was found in the trilobite-rich Floresta Formation in Boyacá, Colombia.
Kingdom: Animalia
Phylum: Brachiopoda
Class: Rhynchonellata
Order: †Spiriferida
Family: †Atrypidae
Genus: †Atrypa
Species: †oklahomensis

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  • Taken with Canon Canon PowerShot SX120 IS
  • Focal Length 8.2 mm
  • Exposure Time 1/60
  • f Aperture f/3.2
  • ISO Speed 80
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