Lophospira
fossil gastropod
Lophospira, genus of extinct gastropods (snails) found as fossils in marine rocks of Ordovician to Devonian age (488 million to 359 million years old). The shell consists of a series of whorls arranged much like a series of ascending steps, each successive whorl smaller than the one below it. The apex of the shell is closed by a small cone-shaped whorl.
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