Nannotax3 - ntax_mesozoic

Common genera

Classification: ntax_mesozoic -> Holococcoliths -> Common genera
Sister taxa: Common genera, Rarer genera

Distinguishing features: The four most commonly recorded genera

Daughter taxa (time control age-window is: 0-800Ma)		Granddaughter taxa
	Calculites Holococcoliths with a proximal plate of four blocks; ridged and pitted distal surface; and short, narrow, hollow spines. Entire coccolith bright in xpl in plan view	C. favosus C. anfractus C. axosuturalis C. obscurus C. ovalis C. rosalyniae C. additus C. cenomanicus C. cyclops C. juliae C. maghredaswampensis C. paulus C. percernis C. proscissus C. turonicus C. sarstedtensis C. suturus C. sp.
	Lucianorhabdus Holococcoliths with a proximal plate of four blocks and tall, hollow spines, which are often ridged or pitted and may be bulbous or curved.	L. cayeuxii L. arcuatus L. compactus L. inflatus L. maleformis L. quadrifidus L. salomonii L. boudagherfadeliae L. tabernus L. turris L. arborius L. cubiterminalis L. phlaskus L. lageniformis L. windii L. sp.
	Orastrum Holococcoliths with narrow rim surrounding a central-area formed of 1-4 blocks. Typically non-cavate with no spine. Rim bright and central plate dark	O. schollei O. asarotum O. campanensis O. porosuturalis O. perspicuum O. robinsonii O. colligatum O. sp.
	Owenia Holococcoliths with a narrow rim and a central structure comprising two or four blocks which typically incorporate a distal bridge-shaped structure which may extend into a spine; the blocks may be perforate.	O. dispar O. hillii O. partitum O. sp.

Taxonomy:

Rank: informal group of genera

Farinacci & Howe catalog pages: Common genera [no catalog entry yet]

Distinguishing features: The four most commonly recorded genera

Search data:

Tags	LITHS: holococcolith,
Metrics	Lith size: 0->0µm;

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): in mid part of Valanginian Stage (54% up, 136.4Ma, in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Holococcoliths

References:

Common genera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2021

Taxon Search:

Advanced Search

Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10268 Go to Archive.is to create a permanent copy of this page - citation notes

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