Nannotax3 - ntax_cenozoic - Calyptrosphaera lluisae

Citation: Calyptrosphaera lluisae Keuter et al. 2021

Basionym: Calyptrosphaera lluisae Keuter et al. 2021

Synonyms:

Calyptrosphaera sp. cf. heimdaliae of Cros & Fortuno 2002

Taxonomic discussion:

As noted by Cros and Fortuño (2002), this species is similar to C. heimdaliae, which, however, has coccoliths with higher covers, wider openings and crystallites arranged in a hexagonal meshwork pattern.

Distinguishing features:
Parent taxon (convex): Holococcoliths with tube, covered distally by a convex cover
This taxon: Low wall with domal cover, ring of small perforations at base of cover and an apical perforation

Farinacci & Howe catalog pages: C. sp. cf. heimdaliae [no catalog entry yet]

Coccospheres are weakly dimorphic, spherical, 8–11μm diameter. Body coccoliths are elliptical calyptroliths 2.2– 2.4 μm long and 0.8–1.2 μm wide, consisting of a tube and a low conical to dome-shaped distal cover. Tube imperforate, weakly flaring, four crystallites high (ca. 0.4μm), sharply separated from the distal cover. At the base of the cover there is a cycle of 18 to 20 pores separated from each other by struts one crystallite wide. The rest of the cover is imperforate, except for a single circular small (ca. 0.2 μm) apical pore, which is visible on most coccoliths. Crystallites are rather irregular in shape and arrangement. Likely circum-flagellar coccoliths, similar to BCs but with a substantially higher distal cover (total height 1.4–1.7 μm) were observed on only a few coccospheres (Fig. 15f). In these putative CFCs often two rows of pores at the base of the BCs were observed. This feature was also observed in all coccoliths of some specimens (Fig. 15c). However, this may represent a different coccolithophore species. [Keuter et al. 2021]

In the GoN C. lluisae occurred for a short time in high numbers (up to 65 cells mL−1) in late spring (mid-June) at the surface and at 60 m depth. Cros and Fortuño (2002) found this holococcolithophore in the western Mediterranean off Spain at the surface and a depth of 5 m. [Keuter et al. 2021]

Geological Range:
Last occurrence (top): Extant. Data source: described from plankton
First occurrence (base): within Extant modern (0.00-0.00Ma, base in "Holocene" stage). Data source: no known fossil record

References:

Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs V O

Keuter, S., Young, J. R., Koplovitz, G., Zingone, A. & Frada, M. J. (2021). Novel heterococcolithophores, holococcolithophores and life cycle combinations from the families Syracosphaeraceae and Papposphaeraceae and the genus Florisphaera. Journal of Micropalaeontology. 40: 75-99. gs O

Calyptrosphaera lluisae

References:

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