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Authority

H.J.Marchant, in Marchant et al. (1987b: 18, figs 12–14)

Class

Craspedophyceae/Choanoflagellida

Order

Choanoflagellida

Family

Acanthoecidae

Additional References

N/A

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Basionym

N/A

Synonyms

N/A

Description

Cells solitary. Lorica 11–12.5 µm long, 4.5 µm diameter; single bell-shaped lorica chamber 6.5 µm long. Longitudinal costae 12–16, extending beyond chamber to form spines 5–5.5 µm long; anterior longitudinal costal strips (3.6–) 6–7 µm long; costae taper from c. 90–60 nm diameter towards anterior end on which is borne a claw; costal strips extend c. 75% of their length beyond the lorica chamber; costal strips of lorica chamber c. 100 nm diameter, c. 4 µm long, with rounded ends. Transverse costae c. 40, spirally arranged; distinctive anterior transverse costa present. Intact protoplasts have not been found.

Distribution

Known only from Ellis Fjord, Vestfold Hills, East Antarctica (Marchant et al., 1987b).

Comments

This species closely resembles A. unguiculata in having anterior spines with claw-bearing tips and a similar arrangement of costae on the lorica chamber. However, A. tintinnabulum differs from other Acanthocorbis species in the structure of the spines. In Acanthocorbis apoda (B.Leadb.) S.Hara & E.Takah., A. unguiculata, and also Acanthoecopsis asymmetrica , the spines are composed of at least 1.5 costal strips, whereas in A. tintinnabulum the spines are less than a single costal strip in length.

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