Abstract

The family Rhipidomellidae (as distinct from family Dalmanellidae) includes the subfamily Rhipidomellinae, (late Ordovician through Permian) with genera Dalejina (synonym: Rhipidomelloides) Mendacella, Pseudodicoelosia, Strixella, Loganella, Aulacella, Thiemella, Rhipidomella, Perditocardinia; and the subfamily Heterorthinae (mid Ordovician to early Silurian) with genera Heterorthis, Diceromyonia, Svobodaina. Genera Reeftonia and Cariniferella are rejected from Rhipidomellidae; Levenea is removed from the Dalmanellidae to the Isoorthidae; Resserella, Fascicostella, Proschizophoria and Teichertina are removed from the Dalmanellidae. Svobodaina is the heterorthinid ancestor of the earliest rhipidomellinid (Mendacella).

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