Taxonomy:
Distinguishing features:
Parent taxon (rotula type): XCs wheel-like, with radial laths well-separated, spoke-like. BCs and XCs both show distinct chirality. CFCs not differentiated.
This taxon: BCs with node-ridge ornament; XCs ornamented elliptical discs can cover coccosphere
Farinacci & Howe catalog pages: S. exigua *
Morphology:
XCs - elliptical, slightly asymmetric, vaulted; rim narrow; lath cycle stubby or absent; central field of a few irregular plates with ridge-like sutures. Can form a complete exotheca.
Size:
Tags | LITHS: murolith, placolith, SHAPE: elliptical, CA: ca_disjunct, grill, plate, CSPH: equant, XC, CROSS-POLARS: R-prominent, T-prominent, |
Metrics | Lith size: 1.5->3µm; Coccosphere size: 7->10µm; Liths per sphere: 35->55 Data source notes: csph & lith length (BCs) from OD & illustrated specimens; lith numbers from Yang & Wei 2003, range of estimates |
Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY rough estimate]
Plot of occurrence data:
Konno, S. & Jordan, R. W. (2006). Lagoon coccolithophorids from the Republic of Palau, NW Equatorial Pacific. Journal of Nannoplankton Research. 28(2): 95-110. gs O Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. 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 OReferences:
![]() |
Syracosphaera exigua compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-8-2022
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1355 Go to Archive.is to create a permanent copy of this page - citation notes |
Comments
(0)