Nannotax3 - Mesozoic - Holococcoliths

Holococcoliths

Ancestry: Mesozoic -> Holococcoliths
Sister taxa: Arkhangelskiales, Eiffellithales, Stephanolithiales, Podorhabdales, Watznaueriales, Syracosphaerales, Heterococcoliths inc sedis, Holococcoliths, Braarudosphaerales, Nannoliths inc sedis, Mesozoic non–coccoliths, hidden,

Short diagnosis: Coccoliths formed of minute (c.0.1µm) rhombohedral micro crystals. Often a life-cycle stage with heterococcolith counterpart(s).

Daughter taxa (blue => in age window 0-300Ma)		Granddaughter taxa
	Common genera The four most commonly recorded genera	Calculites Lucianorhabdus Orastrum Owenia
	Rarer genera Less common genera	Bifidalithus Bilapillus Multipartis Munarinus Octolithus Okkolithus Ottavianus Pharus Ramsaya Russellia Saepiovirgata Acuturris Anfractus Duocameratus Lacunolithus-Bown Metadoga Nicholasia Paulpearsonia Petrobrasiella Pseudoconus Semihololithus Stereorhabdus Tanzanella Thecatus unidentified holococcoliths

Taxonomy:

Citation: Holococcoliths

Rank: informal group

Notes & discussion: Holococcoliths traditonally were all placed in a family the Calyptrosphaeraceae. However, study of modern coccolthophres has shown that holococcoliths are formed during the haploid life cycle stage of coccolithophres and so they are not a phylogenetic group (Young et al. 2003).
The subdivision here into common and rarer genera ismade purelyto highlight those genera which are worth paying attention to first

Farinacci & Howe catalog pages:

Short diagnosis: Coccoliths formed of minute (c.0.1µm) rhombohedral micro crystals. Often a life-cycle stage with heterococcolith counterpart(s).

Ecology & Biogeography: Holococcoliths can occur in any environments at the present day but high abundance and diversity of holococcoliths is considered typical of oligotrophic environments.

Geological Range:
Last occurrence (top): within Thanetian Stage (55.96-59.24Ma, top in Thanetian stage). Data source: Total of range of species in this database
First occurrence (base): within Toarcian Stage (174.15-182.70Ma, base in Toarcian 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: Mesozoic

References:

Young, J.R.; Geisen, M.; Cros, L.; Kleijne, A.; Probert, I. & Ostergaard, J.B., (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research, Special Issue, 1: 1-132.