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Authority
W.N.Ellis Throndsen (1969: 178, fig. 14)
Class
Craspedophyceae/Choanoflagellida
Order
Choanoflagellida
Family
Acanthoecidae
Additional References
Marchant et al. (1987b: 17, figs 9, 10), Marchant & Perrin (1990: 504)
Basionym
N/A
Synonyms
N/A
Description
Cells solitary. Lorica somewhat waisted to form anterior and posterior chambers, 16–17 µm long overall; anterior chamber 10 µm long, 9 µm diameter; posterior chamber 6.5 µm long, 6.4 µm diameter; longitudinal costae c. 13; transverse costae 3 in anterior chamber, 4 in posterior chamber; pedicel sometimes present. Longitudinal costae each comprising 5 costal strips; anteriormost costal strips forming T-junctions or short stalks where they meet the anterior transverse costa. Transverse costal arrangement difficult to discern; a double row of transverse costae surrounds the middle of the anterior lorica chamber [as described by Throndsen (1969)]; another costa at the waist of the lorica; 4 costae in the posterior chamber. Protoplast ellipsoidal to obovoid, 4.2 µm long, situated in the posterior lorica chamber, with a collar of tentacles and a flagellum in the anterior chamber.
Distribution
Inshore Prydz Bay, East Antarctica; North Atlantic waters (Throndsen, 1969, 1974).
Comments
N/A