Tetrarhynchia

Rhynchonelliform brachiopod Jurassic

This small (2 cm from ventral beak to anterior edge) brachiopod with a short curved hinge is strongly ribbed and has a characteristically deep fold in the dorsal valve and corresponding sulcus in the ventral valve. The zig-zag commissure enabled the brachiopod to increase the area open between the two valves, and hence increase nutrient intake, whilst restricting the entrance of larger particulate matter. The brachiopod was attached to the substrate by a small pedicle.

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