(Meunier) Deflandre (1960: 183)
Manton et al. (1975: 1935, figs 1–4, 11–38), Buck & Garrison (1983: 1264, fig. 21), Hara & Tanoue (1984b: 6), Thomsen et al. (1990: 380, figs 59–65)
Corbicula socialis Meunier (1910: 79)
Cells solitary or forming extensive colonies of cells adhering together at their anterior costae. Lorica funnel-shaped, 11–13 µm long, 16–19 µm diameter at anterior edge; longitudinal costae 10; transverse costae 2; with or without a pedicel. Longitudinal costae comprising 10 costal strips, 6 µm long, rounded and flattened, forming characteristic T-junctions where they meet the anterior costa. Transverse costae comprising 10 costal strips, c. 5 µm long. Protoplast ellipsoidal, 3.5–4 µm diameter.
Widely distributed in inshore and oceanic Antarctic waters and in many other parts of the world (Hara & Tanoue, 1984), in water temperatures of –2.4°C (Buck, 1981) to 25°C (Thomsen, 1978a).
Cell size ranges have been documented for Antarctic specimens (Buck, 1981; Takahashi, 1981; Thomsen et al., 1990) as well as for Arctic ‘summer’ specimens (Manton et al., 1976a). Additional illustrations and descriptive details of Antarctic specimens were provided by Hara & Tanoue (1984) and Thomsen et al. (1990).