spirifer
基本解释
石燕贝属
英文释义
n. Any one of numerous species of fossil brachipods of the
genus Spirifer, or Delthyris, and allied genera, in which the long
calcareous supports of the arms form a large spiral, or helix, on each
side.
上一个单词：spiridon
下一个单词：Spiriferella