Stephanolithiales


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

Short diagnosis: Murolith coccoliths with a distal/outer cycle of non-imbricating elements, i.e., in side view, the sutures are vertical or near-vertical.


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Murolith (protolith type) coccoliths with bicylic rims and central-areas spanned by an axial-cross or transverse bar bearing a broad, often long, spine.

Murolith (protolith type) coccoliths with rims of non-imbricate V-units and weakly-developed, or vestigial, proximal/inner-cycles (R-units), with central-areas spanned by one to numerous bars. 

Taxonomy:

Citation: Stephanolithiales Bown & Young, 1997
Rank: Order
Notes & discussion: The order Stephanolithiales probably gave rise to the Ordr Syracosphaerales since Calciosolenia is very similar to various Stephanolthaceae genra and early Syracosphaea species are imlar to Stradnerlithus. So, it may well prove useful to subsume the Stephanolithiales into the Syracosphaerales, see also discussion in Bown et al. (2017)

Farinacci & Howe catalog pages:

Short diagnosis: Murolith coccoliths with a distal/outer cycle of non-imbricating elements, i.e., in side view, the sutures are vertical or near-vertical.


Morphology remarks: Muroliths with a distal/outer-cycle composed of non-imbricating elements, i.e. in side view, the sutures are vertical or near vertical. This feature is not distinguishable from imbrication in the LM. The term protolith is applied to this rim structure (Bown, 1987). The order comprises (1) the Parhabdolithaceae a group of murolith coccoliths typified by thick, robust, high walls, which are charectersic compnoat of Early Jurassic nanofloras, and (2 )the Stephanolithaceae which have similar wall-structure but a more diverse range of morphologies and which

See also: Syracosphaerales ;

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Norian Stage (209.46-228.35Ma, base in Norian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R. & Young, J.R., (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research, 19(1): 21-36.

Bown, P.R., (1998). Triassic. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 29-33.

Bown et al 2017 [sorry, not in our bibliography yet]

Bown, P.R.; Rutledge, D.C.; Crux, J.A. & Gallagher, L.T., (1998). Early Cretaceous. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 86-131.

Bown, P.R., (1987). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology, 38: 118 p.

Bown, P.R., (1987). The structural development of Early Mesozoic coccoliths and its evolutionary and taxonomic significance. Abhandlung der Geologischen Bundesanstalt, 39: 33-49.


Nannotax3 - Mesozoic - Stephanolithiales by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-6-2017

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