How to use Deltidium in a sentence

deltidium
  • The ventral valve is usually the larger, and in many genera, such as Terebratula and Rhynchonella, has a prominent beak or umbo, with a circular or otherwise shaped foramen at or near its extremity, partly bounded by one or two plates, termed a deltidium.

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  • These plates are secreted by the ventral lobe of the mantle, and were named by von Buch in 1834 the " deltidium."

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  • The form of the deltidium varies in different genera.

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  • The American use of the term deltidium for the structure which Europeans call the pseudo-deltidium makes for confusion.

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