Holococcoliths
Classification: Mesozoic -> Holococcoliths
Sister taxa: Arkhangelskiales, Eiffellithales, Stephanolithiales, Podorhabdales, Watznaueriales, Syracosphaerales, Heterococcoliths inc sedis ⟩⟨ Holococcoliths, Braarudosphaerales, Nannoliths inc sedis, Mesozoic non–coccoliths, hidden
Distinguishing features: Coccoliths formed of minute (ca 0.1µm) rhombohedral micro-crystals. Often a life-cycle stage with heterococcolith counterpart(s).
Taxonomy:
Citation: HolococcolithsRank: Informal group of familiesTaxonomic 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: Holococcoliths [no catalog entry yet]
Distinguishing features: Coccoliths formed of minute (ca 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.
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 Thanetian Stage (100% up, 56Ma, in Thanetian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Toarcian Stage (0% up, 182.7Ma, 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. gs V O
