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Authority

K.R.Buck (1981: 47, figs 2 (holotype), 3–7)

Class

Craspedophyceae/Choanoflagellida

Order

Choanoflagellida

Family

Acanthoecidae

Additional References

Buck (1980: 4, figs 3–12), Thomsen et al. (1990: 375, figs 37–48)

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Basionym

N/A

Synonyms

N/A

Description

Cells solitary. Lorica barrel-shaped, 50–75 µm long (excluding pedicel), 25–35 µm diameter. Longitudinal costae 11–13, each comprising 8–9 costal strips, blunt at both ends, extending c. 14 µm beyond anterior transverse costa. Transverse costae 4 or 5, evenly spaced throughout lorica length, each comprising 11–13 costal strips. Pedicel, when present, formed by convergence of longitudinal costae, c. 15 µm long, comprising 2 or 3 costal strips. Protoplast spherical to obovoid, c. 6 µm long, 3–4 µm diameter; flagellum and collar of tentacles arising from the anterior end; veil-like network of fine fibrillar material, suspended from the anterior part of the lorica, often present.

Distribution

Oceanic and inshore stations of Prydz Bay, East Antarctica; Antarctic waters (Buck, 1980, 1981; Takahashi, 1981); Weddell Sea (Buck & Garrison, 1983).

Comments

The veil-like mesh on the inside of the lorica was discussed in Marchant (1985b). Prydz Bay specimens of D. multiannulata may or may not have a pedicel. Loricae of Weddell Sea material were reported by Buck (1981) to be 27–46 µm long and 19–27 µm diameter.

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