Nannotax3 - ntax_cenozoic - Syracosphaera pemmadiscus Nannotax3 - ntax_cenozoic - Syracosphaera pemmadiscus

Syracosphaera pemmadiscus

Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> SY molischii gp -> borealis type -> Syracosphaera pemmadiscus
Sister taxa: S. borealis, S. strigilis, S. pemmadiscus, S. andruleitii


Citation: Syracosphaera pemmadiscus Chang, 2013
taxonomic rank: Species
Taxonomic discussion: Described in - Chang, F.H., 2013. Syracosphaera pemmadiscus sp. nov. (Prymnesiophyceae), an extant coccolithophore from the southwest Pacific Ocean near New Zealand. Phycologia, 52(6): 618-624.

Distinguishing features:
Parent taxon (borealis type): XCs elliptical discs, with a narrow rim, central part without conical depression. CFCs not differentiated.
This taxon: BCs with narrow, fluted, distal flange; XCs smooth elliptical discs with parenthesis shaped openings

Farinacci & Howe catalog pages: S. pemmadiscus *


Inclusion of this species in the borealis type follows Chang (2013) and is based on the similarity of the exothecal planoliths to those of S. borealis and S. hirsuta, and absence of specialised circum flagellar cocoliths (CFCs).
Chang (2013) describes the coccosphere as having two types of exothecal coccoliths - curved planoliths as seen at top right of the holotype coccosphere and muroliths as seen at bottom left. The putative exothecal murolith may, however, be a damaged body coccolith.

Coccospheres 7-8µm; BCs 1.4-1.8 µm long

Ecology & Biogeography

Only records are of two cells in SW Pacific

Search data:
LITHS: murolith, placolith, elliptical, CA: ca_disjunct, grill, plate,
CSPH: equant, XC, CROSS-POLARS: R-prominent, T-prominent,
Lith size: 1.4->1.8µm; Coccosphere size: 7->8µm; Liths per sphere: 50->60
Data source notes: csph & lith length (BCs) from OD
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (Chang 2013)
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:


Chang, F. H. (2013). Syracosphaera pemmadiscus sp. nov. (Prymnesiophyceae), an extant coccolithophore from the southwest Pacific Ocean near New Zealand. Phycologia. 52(6): 618-624. gs

Malinverno, E., Triantaphyllou, M. & Dimiza, M. D. (2016d). Coccolithophore assemblage distribution along a temperate to polar gradient in the West Pacific sector of the Southern Ocean (January 2005). Micropaleontology. 61(6): 489-506. gs


Syracosphaera pemmadiscus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-4-2024

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes

Nannotax is being sponsored through 2024 by Woodside Energy and Shell USA

Add Comment

* Required information
Captcha Image
Powered by Commentics


No comments yet. Be the first!