Nomenclatural notes on <i>Posidonomya clarae</i> Emmrich, 1844, the type species of <i>Claraia</i> Bittner, 1901

Claraia Bittner, 1901 is a prominent extinct bivalve genus of the Permian-Triassic transition (Newell and Boyd, 1995). Although it first appeared in Wuchiapingian (Late Permian; Fang Zong-Jie, 2010), its massive proliferation immediate wake end-Permian mass extinction makes archetype cosmopolitan eurytopic disaster species hallmark base Triassic (e.g., Schubert Bottjer, Diener (1923, p. 38) fixed “ Posidonomya Clarai Emmrich (1844)” as type by subsequent designation, but spelling authorship this have been controversial. This short contribution aims to clarify these issues.