Classification of the genus Penion

G. Penion Fischer 1884
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Penion bellus Conrad 1833
Penion darwinianus Philippi 1887
Penion delabechii Lea 1833
Penion marwicki Finlay 1930
Verconella bella leai Palmer 1937
Invalid names: Austrosipho Cossmann 1906 [synonym]