|Daughter taxa (time control age-window is: 0-800Ma)|
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).
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
|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|
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:
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