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Order

Coccolithophorales

Class

Haptophyceae

Family

Calcidiscaceae

Additional References

N/A

Synonyms

HOL phase synonym: Crystallolithus rigidus Gaarder, in Heimdal & Gaarder (1980)

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Basionym

N/A

Description

Cells covered in heterococcoliths, i.e. coccoliths formed of complex crystals arranged in radial arrays.

This morphotype represents one of three morphotypes (large, intermediate and small) which have been recognised (Kleijne, 1993; Knappertsbusch et al., 1997) and shown to represent discrete taxa (Geisen et al., 2002):

Calcidiscus leptoporus subsp. leptoporus is the intermediate morphotype: coccoliths 5-8 μm; distal shield with 15-30 elements and smoothly curved sutures. The most common form.

Distribution

Species recorded from: 47°S, 146° 31'E. A. McEldowney, AAD, unpub.

47°S, 151°E. L. Harding, AAD, unpub.

Comments

Genus characteristics: Coccoliths (sub-)circular; central area closed or with a narrow opening; distal shield with laevogyral sutures.