Acetabularia crenulata Lamouroux var. monodisca Børgesen, 1936: 65–67, fig. 2 (type locality: Kankesanturai, Jaffna, Sri Lanka).—S. Dixit, 1968: 14.— K. Srinivasan, 1973: 47, pl. XLVII.— Awasthi, 1989: 78.
INDIAN OCEAN DISTRIBUTION: Andaman Islands, Nicobar Islands, Sri Lanka.
Note: Berger & Kaever (1992: 144) implied that this variety is not worthy of recognition.