Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
![]() | ![]() | Clathrolithus Unusual holococcoliths with non-coccolith morphology typically comprising an elliptical, concavo-convex, domed, perforate framework. | |||
![]() | ![]() | ![]() | Corannulus Discoidal holococcoliths with large central openings and marginal perforations or indentations; non-birefringent in plan view. | ||
![]() | ![]() | ![]() | Daktylethra Domed cavate holococcoliths with surficial shallow pits. | ||
![]() | ![]() | Holodiscolithus Elliptical holococcoliths with perforations. | H. agniniae H. catellus H. geisenii H. lippertii H. liui H. macroporus H. minolettii H. serus H. solidus H. whitesideae H. sp. | ||
![]() | ![]() | ![]() | ![]() | Lanternithus Cavate holoccoliths with distinct crystallographic blocks. | |
![]() | Multipartis Holococcoliths with multiple elements in the central area | ||||
![]() | Octolithus Holoccoliths with distinct rim and cover blocks, typically eight. | ||||
![]() | ![]() | ![]() | ![]() | Orthozygus Holococcoliths that typically have a spine or process and transverse bridge or bars. | |
![]() | ![]() | ![]() | ![]() | Quadrilateris Rectangular holococcoliths formed from four thin blocks that are birefringent in XPL. | |
![]() | ![]() | Semihololithus Paleogene holococcoliths usually seen in side view and comprising a thick proximal plate and spine or process, typically with a cavity or axial canal. | S. biskayae S. dimidius S. kanungoi S. pseudobiskayae S. sp. cf. S. biskayae S. tentorium N. figularia N. hexaporus S. sp. | ||
![]() | ![]() | ![]() | ![]() | Varolia Cavate, thin walled, box-like holococcoliths usually seen in side view. | |
![]() | ![]() | ![]() | ![]() | Youngilithus Geometrically shaped non-birefringent holococcoliths typically possessing lateral rim spines and central area bars. | |
![]() | ![]() | Zygrhablithus Spinose holococcoliths, which are birefringent in side view. In plan view the coccoliths are non-birefringent with a distinct figure-of-eight shaped central structure. | |||
Unidentified fossil holococcoliths |
Taxonomy:
Distinguishing features: Holococcolith genera only known from the fossil record
Farinacci & Howe catalog pages: Calyptrosphaeraceae [no catalog entry yet]
Morphology: Whilst this is a very disparate group of genera they are mostly larger than extant holococcoliths and tend to have distinctive shapes, rather than being simple discs.
Tags | LITHS: |
Metrics | Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): in upper part of Ionian Stage (75% up, 0.3Ma, in Ionian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Campanian Stage (0% up, 83.6Ma, in Campanian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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fossil holococcoliths compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 7-3-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=595 Go to Archive.is to create a permanent copy of this page - citation notes |