|Daughter taxa: (blue => in age window 0-800Ma)||Granddaughter taxa|
Aspidorhabdus Hay & Towe 1962
Distinguishing features: Coccoliths without radial lath cycle; coccospheres dimorphic, only some spine-bearing
Farinacci & Howe catalog pages: Rhabdosphaera * , Rhabdolithus * , Aspidorhabdus * , Clavosphaera *
Morphology remarks: Coccosphere: Dimorphic with inner spine-bearing and outer non spine-bearing coccoliths, distributed around coccosphere. Usually non-motile and no differentiation of circum-flagella coccoliths but occasional cells with flagella have been observed (Lohmann 1902, Probert pers. comm.).
Coccoliths: Radial cycle absent, lamellar cycle fills central area and forms spine.
|Tags||LITHS: planolith, elliptical, sub-circular, CA: process, PROCESS: length-slow, parallel-sided, spine, tall, |
CSPH: spherical, equant, BC+process, BC-dimorphic, polymorphic, R-UNITS: spine, R-prominent, DETAILS: ca_disjunct,
|Metrics||Lith size: 3->12µm; Coccosphere size: 8->35µm; |
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): in upper part of Ypresian Stage (84% up, 49.1Ma, in Ypresian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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