nucleoconchとは 意味・読み方・使い方

語源

nucleo- +‎ conch

名詞

nucleoconch (複数形 nucleoconchs または nucleoconches)

1. (zoology) The embryonic shell of a foraminifera, especially the protoconch and deuteroconch of a megalospheric form.
   • 1945, John West Wells, American Old and Middle Tertiary Larger Foraminifera and Corals (page 77)

     This nucleoconch is less than half the size of that seen in the sections of D. crassa.

   • 1954, Alan Hilder Smout, ‎British Museum (Natural History), Lower Tertiary Foraminifera of the Qatar Peninsula (page 25)

     A microspheric nucleoconch does not have an obvious deuteroconch, and is followed by a spiral nepionic stage, no matter what the adult chamber arrangement may be.