Nannotax3 - ntax_cenozoic - Gephyrocapsa sp elevated bridge

Citation: Gephyrocapsa sp. elevated bridge of Young et al., 2003

Synonyms:

Emiliania coronata Martini 1993

Taxonomic discussion:

A range of rare forms occur in which the bridge appears as two high paddle-like plates. These have been illustrated by Nishida (1979; gen. & sp. indet., pl. 4., fig. 4), Winter et al. (1979; Crenalithus? sp. pl. 1 fig. 1; sp cf. fig. G. ornata pl. 1, fig. 10), Heimdal & Gaarder (1981, pl. 4 fig. 22), and Kleijne (1993; Gephyrocapsa? sp. type A pl. 2 fig. 3). There is also one similar formally described species, Emiliania coronata. In the Pliocene Gephyrocapsa duoalata (Martini, 1981) Martini, 1993 is similar.
These are variable forms and none of them have been recorded consistently. So they may represent more than one species, alternatively they may be malformations produced by various species.

See also: Gephyrocapsa small - some similar older forms occur in this grouping including Gephyrocapsa duoalatus;

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within NN20 zone (0.29-0.44Ma, base in Ionian stage). Data source: [JRY rough estimate]

References:

Heimdal, B. R. & Gaarder, K. R. (1981). Coccolithophorids from the northern part of the eastern central Atlantic II. Heterococcolithophorids. “Meteor” Forschungsergebnisse, Reihe D, Biologie. 33: 37-69. gs

Kleijne, A. (1993b). Morphology, Taxonomy and distribution of extant coccolithophorids (Calcareous nannoplankton). Drukkerij FEBO B.V., Katwijk. 1-321. gs

Martini, E. (1981b). Oligocene to Recent calcareous nannoplankton from the Philippine Sea, Deep Sea Drilling Project Leg 59. Initial Reports of the Deep Sea Drilling Project. 59: 547-565. gs V O

Martini, E. (1993). Emiliania coronata, a new calcareous nannoplankton species from the North Atlantic Pleistocene. Zitteliana. 20: 87-92. gs

Winter, A., Reiss, Z. & Luz, B. (1979). Distribution of living coccolithophore assemblages in the Gulf of Elat ('Aqaba). Marine Micropaleontology. 4: 197-223. gs

Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research, Special Issue. 1: 1-132. gs V O

Tags	LITHS: placolith, elliptical, CA: ca_conjunct, grill, bar, CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
Metrics	Lith size: 1.5->3µm;

Gephyrocapsa sp elevated bridge

References:

Comments (0)

Add Comment