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Authority

(B.Leadb.) H.A.Thomsen (1976: 41)

Class

Craspedophyceae/Choanoflagellida

Order

Choanoflagellida

Family

Acanthoecidae

Additional References

Buck & Garrison (1983: 1264, fig. 32), Thomsen et al. (1990: 372, figs 27–32)

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Basionym

Diaphanoeca aperta B.Leadb., in Manton et al. (1975: 22, figs 25–32)

Synonyms

N/A

Description

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.

Distribution

Oceanic and inshore stations in Prydz Bay and Polar Aviation I., East Antarctica; Weddell Sea (Buck, 1981; Thomsen et al., 1990).

Comments

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).

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