|Daughter taxa (time control age-window is: 0-800Ma)|
Cavate holococcoliths comprising a thick proximal plate and a solid domed distal surface with perforations or pits.
Small holococcolith seen in side view comprising a thin proximal plate and a thin-walled tapering distal process that surrounds a central cavity divided in half by a narrow wall.
Small to medium sized cavate holococcolith seen in side view comprising a thin proximal plate, thick walls and a thin-walled, hollow distal process/spine that tapers initially then becomes parallel sided.
Large, blocky, with steep-walled rim and domed upper surface. Only known from LM side view
|Semihololithus sp. cf. S. biskayae|
Similar to Semihololithus biskayae but smaller and with a thinner proximal plate and relatively larger central cavity.
Medium-sized holococcolith seen in side view comprising a thin proximal plate, thick walls and a relatively thick-walled rapidly tapering cavate distal process/spine.
Broadly elliptical coccolith with low tube and high distal cover with four very large openings
Small elliptical holococcolith with domal cover with single cycle of ca 7 large pores
Specimens which cannot be assigned to any established species
Distinguishing features: Paleogene holococcoliths usually seen in side view and comprising a thick proximal plate and spine or process, typically with a cavity or axial canal.
Farinacci & Howe catalog pages: Semihololithus *Search data:
|Metrics||Lith size: 3->7µm;|
Last occurrence (top): at top of Priabonian Stage (100% up, 33.9Ma, in Priabonian stage). Data source: Total of range of species in this database
First occurrence (base): near top of Selandian Stage (87% up, 59.5Ma, in Selandian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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