Lotharingius


Classification: Mesozoic -> Watznaueriales -> Watznaueriaceae -> Lotharingius
Sister taxa: Bussonius, Cyclagelosphaera, Diazomatolithus, Lotharingius, Watznaueria, Ansulasphaera, Bibreviconus, Perchnielsenella,

Distinguishing features: Elliptical watznaueriacean coccoliths typically with central-area axial cross, with or without additional lateral bars. Cross usually spine bearing. Extinction figure with nearly straight arms. 


Daughter taxa: (blue => in age window 0-800Ma)
species with narrow central area
Small, broadly elliptical Lotharingius with narrow central area spanned by spine-bearing axial cross.
Elliptical Lotharingius with a small, narrowly elliptical central area, with a transverse cross-bar
Sub-circular Lotharingius, with a very narrow central area and an axial cross
species with wide central area
Medium to large Lotharingius with wide central area spanned by axial cross with additional lateral bars.
Medium to large Lotharingius with broad shields and relatively wide central area spanned by lozenge-shaped longitudinal structure, transverse bars with additional lateral bars (around 16).
Small, narrowly elliptical Lotharingius with central area axial cross with additional lateral bars (around 12).
Narrow-rimmed Lotharingius with axial cross and lateral bars
Lotharingius with central area filled with a granular plate.
Specimens not identified to species level

Taxonomy:

Citation: Lotharingius Noël, 1973
Rank: Genus
Type species: Lotharingius barozii Noël, 1973.
Synonyms: Bennocyclus Zweili and Grün, 1974 in Grün et al., 1974.
Notes & discussion: The genus appears to be sub-divided into an improbably large number of poorly differentiated species and to be in need of taxonomic revision or better documentation of the species.

Ferreira et al. (2017) showed that multiple species increase in size between the lower and middle Toarcian, it would be possible to use separate names for the small and large forms but we do not consider that this would aid comprehension.

Farinacci & Howe catalog pages: Lotharingius + * , Bennocyclus *

Distinguishing features: Elliptical watznaueriacean coccoliths typically with central-area axial cross, with or without additional lateral bars. Cross usually spine bearing. Extinction figure with nearly straight arms. 


Morphology remarks: In addtion to the central area differences Lotharingius specimens typically show simpler extinction crosses in cross-polarised light, possibly as result of lower imbrication of shield elements [oral comm. by Mattioli during Jurassic Workshop, Lyon 2016]

Evolution & Phylogeny: Thought to be the ancestral genus of the Watznaueriales, see e.g. Bown (1987)

Geological Range:
Last occurrence (top): in upper part of Oxfordian Stage (79% up, 158.6Ma, in Oxfordian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Pliensbachian Stage (40% up, 187.6Ma, in Pliensbachian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

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

Ferreira, J., Mattioli, E. & van de Schootbrugge, B. (2017). Palaeoenvironmental vs. evolutionary control on size variation of coccoliths across the Lower-Middle Jurassic. Palaeogeography Palaeoclimatology Palaeoecology. 465(A): 177-192. gs

Grün, W., Prins, P. & Zweili, F. (1974). Coccolithophoriden aus dem Lias epsilon von Holzmaden (Deutschland). Neues Jahrbuch für Geologie und Paläontologie Abhandlungen. 147: 294-328. gs

Noël, D. (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle. 3e serie, 75: 95-156. gs


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Lotharingius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-11-2019

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