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Eric Simon (1996)

Cyclothyris elegans (von Hanstein, 1879) and Cretirhynchia tenuicostata (von Hanstein, 1879), two valid Lower Maastrichtian rhynchonellid brachiopods from the phosphatic chalk of Ciply, Belgium.

Bulletin de l'Institut Royal des Sciences Naturelles de Belgique - Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen, 66:97-108.