(B.Leadb.) H.A.Thomsen (1976: 41)
Buck & Garrison (1983: 1264, fig. 32), Thomsen et al. (1990: 372, figs 27–32)
Diaphanoeca aperta B.Leadb., in Manton et al. (1975: 22, figs 25–32)
Cells usually solitary, sometimes in clumps of 10–40 cells. Lorica barrel-shaped, 25–40 µm long, 12–18 µm diameter. Longitudinal costae 12–13, projecting beyond the transverse costae at both ends, each comprising 8–9 costal strips; costal strips 4 µm long, the anteriormost strip thinner than the others. Costal strips of the 2 transverse costae L-shaped, with the foot of the L pointing toward the anterior end of lorica, each 5 µm long. Protoplast ellipsoidal, 4 µm diameter, situated centrally in the lorica.
Oceanic and inshore stations in Prydz Bay and Polar Aviation I., East Antarctica; Weddell Sea (Buck, 1981; Thomsen et al., 1990).
There is considerable variation in the morphology of the costal strips. Details of lorica and costal strip dimensions for material from the Weddell Sea were provided by Thomsen et al. (1990).