Nannotax3 - ntax_cenozoic - Tergestiella <title>Nannotax3 - ntax_cenozoic - Tergestiella


Classification: ntax_cenozoic -> Mesozoic Survivors -> Watznaueriaceae -> Tergestiella
Sister taxa: Cyclagelosphaera, Tergestiella, Watznaueria

Daughter taxa (time control age-window is: 0-800Ma)
Tergestiella adriatica
Tergestiella species with the tube core elements forming a flat surface on the distal shield from which the inner tube elements protrude as a central cone. Pores occur both at the centre of the cone and between the tube core and distal shield elements. - Hagino et al. (2015).


Citation: Tergestiella Kamptner, 1941
Rank: Genus
Type species: Tergestiella adriatica Kamptner 1941
Synonyms: Cyclagelosphaera Noel 1965. This is a better known genus, described from the Jurassic, but the coccoliths show no significant differences (Hagino et al. 2015), some authors may however prefer to retain use of the genus Cyclagelosphaera at least for Mesozoic and Paleogene species.
Taxonomic discussion: This genus was rediscovered by Hagino et al. (2015)

Distinguishing features:
Parent taxon (Watznaueriaceae): Placoliths or modified placoliths with R-unit well developed, forming proximal and distal shield elements with opposite senses of imbrication; the V-unit typically forms a narrow distal cycle near the inner edge of the shield. Central-area structures are typically disjunct. Birefringent LM image, in which the V-unit cycle appears only as a thin, dark line.
This taxon: Circular watznaueriacean placolith coccoliths.

Farinacci & Howe catalog pages: Tergestiella + *



Ecology & Biogeography

Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: placolith, circular, CA: ca_conjunct, closed,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
Lith size: 4.3->6.4µm; Coccosphere size: 10->12µm; Liths per sphere: 11->13
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 Chattian Stage (0% up, 28.1Ma, in Rupelian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Hagino, K. et al. (2015). Re-discovery of a “living fossil” coccolithophore from the coastal waters of Japan and Croatia. Marine Micropaleontology. 116(1): 28-37. gs

Kamptner, E. (1941). Die Coccolithineen der Südwestküste von Istrien. Annalen des Naturhistorischen Museums in Wien. 51: 54-149. gs O


Tergestiella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 31-1-2023

Taxon Search:
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AphiaID: 836608 Nomenclatural data on WoRMS
Short stable page link: Go to to create a permanent copy of this page - citation notes

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