Nannotax3 - ntax_mesozoic - Lotharingius

Lotharingius


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

Distinguishing features:
Parent taxon (Watznaueriaceae): Placoliths or modified placoliths with R-unit well developed, forming proximal and distal shield elements with opposite senses of imbrication; the V-unit typically forms a narrow distal cycle near the inner edge of the shield. Central-area structures are typically disjunct. Birefringent LM image, in which the V-unit cycle appears only as a thin, dark line.
This taxon: 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 (time control age-window is: 0-800Ma)
species with narrow central area
Lotharingius hauffii
Small (2.5-4µm), broadly elliptical Lotharingius ; central area narrow with spine-bearing axial cross.
Lotharingius frodoi
Small (4-5 µm) elliptical Lotharingius; central area narrow with transverse cross-bar
Lotharingius umbriensis
Small (3.5-5 µm) sub-circular Lotharingius; central area very narrow with axial cross
species with wide central area
Lotharingius crucicentralis
Medium to large (6-13 µm) Lotharingius; central area wide with axial cross and additional lateral bars.
Lotharingius sigillatus
Medium (4-7 µm) Lotharingius; central area relatively wide, with lozenge-shaped longitudinal structure, and additional lateral bars (around 16).
Lotharingius barozii
Small (3-5 µm), narrowly elliptical Lotharingius; central area with axial cross and lateral bars (around 12).
Lotharingius primitivus
Small (ca 3µm) Lotharingius; central area wide with axial cross and lateral bars
Lotharingius velatus
Medium (5-7 µm) Lotharingius ; central area filled by a granular plate.
Lotharingius sp.
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.

Taxonomic 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:
Parent taxon (Watznaueriaceae): Placoliths or modified placoliths with R-unit well developed, forming proximal and distal shield elements with opposite senses of imbrication; the V-unit typically forms a narrow distal cycle near the inner edge of the shield. Central-area structures are typically disjunct. Birefringent LM image, in which the V-unit cycle appears only as a thin, dark line.
This taxon: 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: 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]


Phylogenetic relations: Thought to be the ancestral genus of the Watznaueriales, see e.g. Bown (1987)

Search data:
TagsLITHS: placolith, elliptical, CA: cross-axial, ca_disjunct, grill, process,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 2.5->13µm;
Data source notes: size range of included species
The morphological data given here can be used on the advanced search page. See also these notes

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: 1-118. 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. 75 [1972]: 95-156. gs V O


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Lotharingius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-12-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10593 Go to Archive.is to create a permanent copy of this page - citation notes



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