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Authority

W.N.Ellis (1929: 77, figs 6, 7)

Class

Craspedophyceae/Choanoflagellida

Order

Choanoflagellida

Family

Acanthoecidae

Additional References

Leadbeater (1972e: 199, figs 7–10), Buck & Garrison (1983: 1264, figs 18, 19)

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Basionym

N/A

Synonyms

N/A

Description

Cells solitary. Lorica 9–10 µm long, 3.8–4.6 µm diameter. Longitudinal costae 10–12; anterior longitudinal costae protruding beyond lorica, forming spines 1.5–2 µm long, slightly incurved. Transverse costae c. 16–20, spirally arranged. Intact protoplasts not seen.

Distribution

Ellis Fjord, Vestfold Hills, East Antarctica (Marchant et al., 1987b); Weddell Sea (Buck & Garrison, 1983); coastal Europe (Ellis, 1929; Leadbeater, 1972e; Thomsen, 1973; Leadbeater & Morton, 1974); North Pacific (Norris, 1965).

Comments

The Antarctic specimens have the same spiral arrangement of lorica costal strips as was described in detail for coastal Denmark by Leadbeater (1972e). Smaller specimens, 6–7 µm long and with 8 longitudinal costae, were reported from the coastal North Pacific (Norris, 1965).

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