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Authority

E.Takah. (Takahashi, 1981a: 9, fig. 20)

Class

Craspedophyceae/Choanoflagellida

Order

Choanoflagellida

Family

Acanthoecidae

Additional References

Marchant & Perrin (1986: 209, fig. 4), Thomsen et al. (1990: 382, fig. 70)

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Basionym

N/A

Synonyms

N/A

Description

Cells solitary. Lorica bell-shaped, to 16.5 µm long, 8 µm diameter at the level of the anterior transverse costa. Longitudinal costae 9 or 10, longitudinally or obliquely arranged, each comprising 3 thick costal strips; anterior costal strips 7.2 µm long, 0.1 µm thick, sharply pointed, extending beyond the transverse costa; centrally located costal strips blunt-ended; posterior costal strips variable in thickness, but thicker than the others. Transverse costa solitary, comprising c. 20 thick round-ended costal strips, located c. halfway along the length of the anterior longitudinal costal strip; costal strips 3 µm long, 0.3 µm thick. Pedicel, if present, variable in length but shorter than the lorica. Intact protoplasts not seen in the Prydz Bay material.

Distribution

Sea-ice, Burton Lake (tidal lagoon in the Vestfold Hills), Crooked Fjord and other coastal waters off Davis Station, East Antarctica (Marchant & Perrin, 1986); Lützow-Holm Bay (Takahashi, 1981a).

Comments

There appears to be some variation in the thickness of the costae in the posterior of the lorica. In organisms with a long pedicel the costae are thin, some with pointed ends similar to the costal strips of the anterior longitudinal costae. Organisms with a short pedicel sometimes have markedly thickened, posterior costal strips. Specimens with either long or short pedicels were observed in Prydz Bay (Marchant & Perrin, 1986).

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