Saturday, November 1, 2014

Amphistrophia funculata brachiopod from the Wenlock Fm.

Amphistrophia funculata is a strophomenid type brachiopod from the Silurian aged (Wenlock epoch, Sheinwoodian to Homerian stage), Wenlock formation, near Dudley, England. It has the typical arrangement of valves with the pedicle valve being convex and the brachial valve concave. To me this looks very similar to a Strophomena sp. brachiopods from the Ordovician. Fine radial ribs decorate the surface and the shell makes a sharp turn along the margin to grow perpendicular to the previous direction. The hinge line is straight with a very long and narrow interarea between the valves.

Pedicle valve
Brachial valve

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