SY pulchra gp


Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> SY pulchra gp
Sister taxa: SY pulchra gp, SY molischii gp, SY nodosa gp, SY mediterranea group, Syraco - fossil, S. sp.

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
dilatata type
BCs with 3 flanges, but mid-wall flange weakly developed, as ring bead-like nodes; XCs muroliths, similar to BCs.

noroitica type
BCs with proximal flange only, weakly developed inner wall. Coccospheres are highly varimorphic, the apical BCs have a robust central structure, this decreases toward the antapical area where there are BCs without a central structure. CFCs spine-bearing, with bifurcate tip. XCs muroliths.

prolongata type
BCs with 3 flanges and spines or bosses, CFCs spine-bearing, with bifurcate tip. XCs muroliths with spines.

pulchra type
BCs with 3 flanges, CFCs spine-bearing, with notched tip. XCs dome-shaped.

Taxonomy:

Citation: SY pulchra gp Young et al., 2003
Rank: species group
Taxonomic discussion: We have included in this group all Syracosphaera species which have body coccoliths with three flanges and/or spines, and these species also have exothecal coccoliths which are either muroliths or dome-shaped. However, only a few species (S. histrica, S. prolongata) show all of these characters so the group is more heterogeneous and perhaps more artificial than the S. nodosa and S. molischii groups. It is, however, very convenient for identification of species.

Distinguishing features: BCs - with distal, mid-wall and basal flanges (except S. noroitica type), and/or with low spines (except S. pulchra and S. dilatata type).
XCs - dome-shaped or muroliths.
CFCs - usually spine-bearing with bifurcate spine-tip.

Farinacci & Howe catalog pages: SY pulchra gp [no catalog entry yet]


Morphology: The exothecal cocociths of this group are very diverse, howver, a common feature is that there is no separate central plate formed of a few larger elements, as is seen in most other Syracosphaera exothecal coccoliths. Intead the radial laths are usually multipart and form the entire central structure. The XC laths also protrude beyond the rim to form beaded margin in noroitica & prolongata types. 

Search data:
TagsLITHS:
MetricsLith size: 1.1->8µm; Coccosphere size: 8->70µm;
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: Total of range of species in this database
First occurrence (base): at base of Zanclean Stage (0% up, 5.3Ma, in Zanclean stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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


nannotaxlogo400px

SY pulchra gp compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-5-2021

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1333 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics