21078 - New Species Symphysurus ebbestadi n. sp. With Preserved Sensory Lines Ordovician Annularia Trematoceras
Description
21078 New Species Symphysurus ebbestadi n. sp. With Preserved Sensory Lines Ordovician Annularia Trematoceras Trematoceras Sister taxa: Alceste The shelly fossil record shows a well recognized pattern of macroevolutionary stasis between the Cambrian Explosion and the Great Ordovician Biodiversification Event See also Fortey 1975
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