orbitoidとは 意味・読み方・使い方

名詞

orbitoid (複数形 orbitoids)

1. Any foraminifer of the family Orbitoididae.
   • 1918, Joseph Augustine Cushman, “Orbitoid Foraminifera of the genus Orthophragmina from Georgia and Florida”, in David White, editor, Shorter Contributions to General Geology, 1917, page 115:

     The larger orbitoid Foraminifera of the Western Hemisphere are very inadequately known, yet their occurrence in great numbers has been noted in many papers during the last three- quarters of a century.

   • 1983, Ulrich Lehmann, Fossil Invertebrates, page 30:

     The orbitoids are larger foraminifera. Their tests are radial hyaline and perforate with a discoidal growth pattern, i.e. the chambers are arranged in rings.