Hughesius

Cenozoic Taxa

Hughesius tasmaniae

Edited by Lyndsey on Thu, 10/03/2011 - 10:03

Hughesius tasmaniae (Edwards and Perch-Nielsen, 1975) de Kaenel and Villa, 1996 [Ericsonia]

Description: Medium sized species of Hughesius (3-5μm long), with 4 plates in central-area.

Remarks: This species is intermediate between Clausicoccus fenestratus and Hughesius gizoensis, in terms of size, number of plates, and rim birefringence. It probably forms part of an evolutionary lineage between these species.

Original description:

Range: Palaeogene to NN9 (rare above NN3).

Synonym: Recorded as Hughesius sp. by Varol, 1989.

Geological Time Data

Geological Time Periods:

NN9

Paleogene

Biblio Reference:

Young, JR. 1998. Neogene. Calcareous nannofossil biostratigraphy. :225-265.

Notes on occurrence information:

Rare above NN3

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600 reads
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Neogene: Hughesius; Hughesius tasmaniae

Hughesius

Edited by Lyndsey on Tue, 01/03/2011 - 11:57

Genus Hughesius Varol, 1989

Description: Placolith coccoliths showing low birefringence with central area filled by 2 to 4 plates, without obvious perforations.

Remarks: There appears to be a lineage extending from Clausicoccus fenestratus via H. tasmaniae to H. gizoensis, involving size decrease and reduction of the R-units. H. tasmaniae is very similar to Clausicoccus and essentially is Clausicoccus without prominent perforations, H. gizoensis seems to have a simpler shield structure, possibly as a result of the smaller size.

Type species: H. gizoensis Varol 1989

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Neogene: Clausicoccus fenestratus; Hughesius
Paleogene: Clausicoccus fenestratus

Coccolithaceae

Edited by Jeremy Young on Tue, 02/02/2010 - 23:12

FAMILY COCCOLITHACEAE Poche, 1913 emend Young & Bown 1997

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

Genera included:

	Coccolithus - dominant genus, with central area open, spanned by a disjunct bar, or delicate axial cross (separation from Cruciplacolithus is tenuous)
	Clausicoccus - central area covered by perforate plate, common in the Palaeogene, and extends into Early Miocene
	Coronocyclus - open ring-like coccolith without shields, elements of rim complexly intergrown, apparently with outer V-unit and inner R-unit
	Cruciplacolithus - with disjunct axial cross in central area
	Hughesius - with central plate formed of 4 or fewer disjunct elements
	Solidopons - with narrow rim spanned by oblique disjunct bridge
	Chiasmolithus, Sullivania - Palaeogene genra with diagonal cross in central area

Remarks:

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3261 reads
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Neogene: Clausicoccus; Coccolithaceae; Coccolithus; Coronocyclus; Cruciplacolithus; Hughesius; Solidopons

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