Nannotax3 - ntax_main - SY nodosa gp Nannotax3 - ntax_main - SY nodosa gp

SY nodosa gp


Classification: ntax_main -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> SY nodosa 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
XCs symmetric
anthos type
Similar to S. nodosa type but XCs robust with broad rim, curved sutures and conical central structure.
Syracosphaera anthos
Syracosphaera kareniae

lamina type
Similar to S. nodosa type, but XCs large and rather weakly calcified with only narrow radial cycle. BCs thin-walled with crenulate top. No spines on CFCs so endotheca monomorphic
Syracosphaera aurisinae
Syracosphaera tumularis
Syracosphaera sp. cf. tumularis 1
Syracosphaera sp. cf. tumularis 2
Syracosphaera gaarderae
Syracosphaera rhombica

nodosa type
XCs planoliths, circular to elliptical, radial cycle variably developed, form complete exotheca. BCs muroliths with proximal flange; wall slightly flaring; no spines; sharp radial laths. CFCs with spines (except Syracosphaera leptolepis)
Syracosphaera leptolepis
Syracosphaera nana
Syracosphaera nodosa
Syracosphaera serrata
Syracosphaera sp aff nana

XCs asymmetric, form chains
bannockii type
XCs are irregular planoliths, asymmetric rim, narrow medial cycle, often occurring in a ribbon-like arrangement. BCs muroliths with proximal flange; wall low; radial laths rather broad and flat. CFCs have spines, with simple rounded tips.
Syracosphaera bannockii
Syracosphaera orbiculus
Syracosphaera sp. aff orbiculus

laminated type
XCs consist partly or entirely of several layers of superposed elements. CFCs with spines
Syracosphaera reniformis
Syracosphaera squamosa


Taxonomy:
Citation: S. nodosa group of Young et al. 2003
Taxonomic rank: species group

Synonyms:

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 muroliths, without distinct inner wall cycle; laths rather broad. XCs planoliths.

Search data:
Lith size: 1->4µm; Coccosphere size: 4->40µm;
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:

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


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

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1332 Go to Archive.is to create a permanent copy of this page - citation notes



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