deltidiodontとは 意味・読み方・使い方

形容詞

deltidiodont (not comparable)

1. (zoology, of hinge teeth) Simple in shape, not interlocking with the dental socket.
   • 1979, Michael Robert House, The Origin of Major Invertebrate Groups, page 235:

     The orthide billingsellaceans with their strophic hinge lines, deltidiodont dentition and invariably calcareous shells, comprise two families which, although morphologically similar, have a fundamentally different style of shell secretion, reflected in their various descendants.

   • 2001, David Harper and Rong Jia-Yu, “Palaeozoic brachiopod extinctions, survival and recovery”, in Geological Journal, volume 36, page 317:

     The deltidiodont morphology did not survive the end-Permian extinctions; the modern articulated brachiopod fauna is dominated by cyrtomatodonts with crurae and loops.

   Antonyms: cyrtomatodont