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Authority

(B.Leadb.) H.A.Thomsen (1988: 320, figs 16–22)

Class

Craspedophyceae/Choanoflagellida

Order

Choanoflagellida

Family

Acanthoecidae

Additional References

Hara et al. (1986: 75, fig. 12)

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Basionym

Pleurasiga cupula B.Leadb. (Leadbeater, 1972b: 201, figs 1e (holotype), 16, 17)

Synonyms

N/A

Description

Cells solitary. Lorica cup-shaped, somewhat waisted to form two chambers, 6–10 µm long, 6–9 µm diameter; longitudinal costae 8–11; transverse costae 3 in anterior chamber, 2 in posterior chamber. Longitudinal costae each comprising 3 costal strips, the posteriormost converging spirally with several transverse costal strips towards the posterior end of the lorica. Protoplast ovoid, 2–3 µm long, 1–2 µm diameter, located in posterior chamber; flagellum 4–5 µm long; collar of 10–15 tentacles, each c. 2 µm long.

Distribution

Indian sector of the Southern Ocean (Hara et al., 1986); coastal Denmark (Leadbeater, 1972b; Thomsen, 1973).

Comments

Further details of lorica strucure were described and illustrated by Thomsen (1988).

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