| 单词 | orthoceran |
| 释义 | > as lemmasorˈthoceran orˈthoceran adj. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Cephalopoda > [adjective] > belonging to order Tetrabranchiata > belonging to family Orthoceratidae orthoceran1884 1884 Science 1 Feb. 127/1 Evidence..that the Ammonoidea, with their distinct embryos, arose from the orthoceran stock. 1901 Amer. Naturalist 35 39 Until a few years ago Baculites was supposed to be an ammonite that had reverted to the orthoceran form. 1944 Amer. Midland Naturalist 32 766 The structural pattern which Dunbar..figured for Atractites, namely a simple and well defined orthoceran living chamber orad of the phragmocone. < as lemmas |
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