Deltidium sentence example

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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  • f, foramen; d, deltidium; t, teeth; a, adductor impressions (= occlusors, Hancock); c, divaricator (=cardinal muscles, King, = muscles diducteurs principaux, Gratiolet); c', accessory divaricators (muscles diducteurs accessoires, Gratiolet); b, ventral adjustor (=ventral peduncular muscles, or muscles du pedoncule paire superieure, Gratiolet); b', peduncular muscle.
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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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  • deltidium.
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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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  • Deltidium.
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  • Deltidium present, but no pro-deltidium.
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