lituiticoneとは 意味・読み方・使い方

語源

From or related to the genus name Lituites.

名詞

lituiticone (複数形 lituiticones)

1. (malacology) A conch or shell which completes few whorls in the beginning, and thereafter becomes a straight cone.
   • 1964, New Mexico. Bureau of Mines and Mineral Resources, Memoir:

     An endogastric cyrtocone, the basal part sectioned showing the position of the siphuncle P.
     A lituiticone. All side views, except M, have the shell oriented with the venter to the left a a earlier whorls.

   • 1986, Paolo Arduini; Giorgio Teruzzi, Simon & Schuster's Guide to Fossils, Simon & Schuster:

     Description A nautiloid with a shell only partially coiled in a flat spiral (lituiticone) : the coiling appears in the first whorls, which may be only slightly touching, and the shell subsequently develops in a straight line […]

   • 2020 March 10, Winston Frank Ponder; David R. Lindberg; Juliet Mary Ponder, Biology and Evolution of the Mollusca, Volume 2, CRC Press, →ISBN:

     […] The shells are slender orthocones or rapidly expanding lituiticones, either weakly cyrtoconic or with the apical part spirally […]