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Revision of Coccolithaceae from Fri, 28/03/2008 - 01:40

Fri, 28/03/2008 - 10:11 — Jeremy Young
Citation: 
FAMILY COCCOLITHACEAE Poche, 1913 emend Young & Bown 1997

Description: Coccoliths are placoliths with rim structure similar to Coccolithus: V-unit forms distal shield and lower cycle of central-area; R-unit forms proximal shield and upper cycle of central-area.

Genera included:

4-4pelagicus.JPG Cpel175-42NN21.JPG Coccolithus - dominant genus, with central area open, spaned by a disjunct or delicate axial cross (separation fom Cruciplacolithus is tenuous)
4-7fenestratus.JPGclausicoccus.jpg Clausicoccus - central area covered by perforate plate, common in the Palaeogene, and extends into Early Miocene
5-13nitescens.JPG Cornit265-15NN5.JPGcoronocyclus_nitescens.jpg Coronocyclus - open ring-like coccolith
without shields, elements of rim complexly intergrown, apparently with
outer V-unit and inner R-unit
Crpl202 (471-2) 27NN14-15.JPG Cruciplacolithus - with disjunct axial cross in central area
5-23tasmaniae.JPGhughesius_tasmaniae.jpg Hughesius - with central plate formed of 4 or fewer disjunct elements
4-9petrae.JPGsolidopons_petrae.jpg Solidopons - with narrow rim spanned by oblique disjunct bridge
Chiasmolithus, Sullivania - Palaeogene genra with diagonal cross in central area

 

  • Coccolithus
  • Chiasmolithus
  • Cruciplacolithus
  • Solidopons
  • Sullivania
  • Clausicoccus
  • Hughesius


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