Calyptotheca orbiculata Harmer 1957

Harmer 1957. The Polyzoa of the Siboga Expedition. Part IV. Cheilostomata Ascophora, II. (Ascophora, except Reteporidae, with additions to Part II, Anasca). Siboga Expeditie No, 28d 1957: i-xv 641-1147