Nannotax3 - ntax_main - SY pulchra gp

Nannotax3 - ntax_main - SY pulchra gp Nannotax3 - ntax_main - SY pulchra gp

SY pulchra gp

Classification: ntax_main -> 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.	Syracosphaera arethusae Syracosphaera dilatata Syracosphaera azureaplaneta Syracosphaera corolla
	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.	Syracosphaera noroitica Syracosphaera castellata Syracosphaera florida Syracosphaera winteri
	prolongata type BCs with 3 flanges and spines or bosses, CFCs spine-bearing, with bifurcate tip. XCs muroliths with spines.	Syracosphaera prolongata
	pulchra type BCs with 3 flanges, CFCs spine-bearing, with notched tip. XCs dome-shaped.	Syracosphaera histrica Syracosphaera pulchra

Taxonomy:

Citation: S. pulchra group of Young et al. 2003

Taxonomic 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.

Synonyms:

S. pulchra group of Young et al. 2003

Distinguishing features:
Parent taxon (Syracosphaera): Coccospheres usually dithecate. Exothecal coccoliths (XCs) highly variable. Endothecal coccoliths are muroliths with 1, 2 or 3 flanges, the forms with 2 flanges are often placolith-like.
This taxon: 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.

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:

Lith 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 ranges of the species in this database
First occurrence (base): within Pliocene Epoch (2.59-5.33Ma, base in Zanclean stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested.
See also: customisable plot Parent: Syracosphaera

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. S1: 1-132. gs

SY pulchra gp compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-7-2026

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

Add Comment

Comments

No comments yet. Be the first!