Differentiation of species ofTerebratella(Brachiopoda: Terebratellinae)

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Abstract
Terebratella sanguinea and T. incollSpicua have been differentiabed on foramen position and ornament. Further comparison shows that the valves of T. sanguinea are more strongly curved than those of T. inconspicua, a condition resulting in a longer pedicile, a larger beak, and hinge plates with greater elevation. The relationship between hinge plate ccndition and shell curvature is evident in other terebratellid genera.