Upper Ordovician – Silurian
Paupospira is an extinct genus of facultatively mobile epifaunal suspension feeders
Identification in Hand Sample:
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- Conversely, reduced monophyletic definitions recognizing only the clades terminated in the Ashgill fail to recognize that the group diverged during the Middle Ordovician. A new monophyletic genus, Paupospira, also illustrates how strictly monophyletic higher taxa can obfuscate historical patterns. That genus is nearly eliminated by the end-Ordovician extinction, but a sole survivor is known from the Llandovery. The genus’ demise somewhat misleadingly now represents a “background” extinction (Jablonski, 1986).