Nannotax3 - ntax_mesozoic - Lucianorhabdus

Lucianorhabdus


Classification: ntax_mesozoic -> Holococcoliths -> Common genera -> Lucianorhabdus
Sister taxa: Calculites, Lucianorhabdus, Orastrum, Owenia

Distinguishing features:
Parent taxon (Common genera): The four most commonly recorded genera
This taxon: Holococcoliths with a proximal plate of four blocks and tall, hollow spines, which are often ridged or pitted and may be bulbous or curved.


Daughter taxa (time control age-window is: 0-800Ma)
cayeuxi and variants
Lucianorhabdus cayeuxii
Typical Lucianorhabdus species, base only slightly wider than process
Lucianorhabdus arcuatus
Lucianorhabdus with abruptly-curved, ridged, process.  Hattner & Wise (1980) included these forms in their "L. cayeuxi plexus", on the grounds that intergrade with L. cayeuxi and have similar stratigraphic range. Burnett (1998) regards them as separate secies and records different ranges for them.
Lucianorhabdus compactus
Lucianorhabduswith base wider than process, may end in plug
Lucianorhabdus inflatus
Lucianorhabdus with process wider than base, maximum width in lower half of the stem.
Lucianorhabdus maleformis
Lucianorhabdus with base wider than process
Lucianorhabdus quadrifidus
Lucianorhabduswith base wider than process, ends in crown-like plug
Lucianorhabdus salomonii
Lucianorhabdus with process of similar initial width to basal disk; shows bright longitudinal band in LM.
conical species
Lucianorhabdus boudagherfadeliae
Small (4-6 µm) Lucianorhabdus with short conical, bluntly-terminated process. 


Lucianorhabdus tabernus
Medium sized (5-8 µm) Lucianorhabdus with short conical, pojnted process and thin baseplate
Lucianorhabdus turris
Medium sized (6-10 µm) Lucianorhabdus with long, tapering process
distinctive species
Lucianorhabdus arborius
Lucianorhabdus with frondose, tree-like, process
Lucianorhabdus cubiterminalis
Lucianorhabdus with cubic base and curved ridged process
Lucianorhabdus phlaskus
Medium sized (5-6 µm) Lucianorhabdus with massive smooth process ending in bulb-like expansion
Lucianorhabdus lageniformis
Lucianorhabdus with short bulb-like process with honeycomb-like ridges
Lucianorhabdus windii
Lucianorhabdus with elongate bulb-like process with honeycomb-like ridges
Lucianorhabdus sp.
Specimens not identified to species level

Taxonomy:

Citation: Lucianorhabdus Deflandre, 1959
Rank: Genus
Type species: Lucianorhabdus cayeuxii Deflandre, 1959
Synonyms: Isocrystallithus Verbeek 1976

Farinacci & Howe catalog pages: Lucianorhabdus * , Isocrystallithus *

Distinguishing features:
Parent taxon (Common genera): The four most commonly recorded genera
This taxon: Holococcoliths with a proximal plate of four blocks and tall, hollow spines, which are often ridged or pitted and may be bulbous or curved.


Morphology: The base of the coccolith is surrounded by a narrow rim with radial c-axes, this is often clearly visible in side views.


Size: Often very large - L. cayeuxi is from 10 to 30 µm long with base about 5-7µm across. Most other species have similar size bases.

Search data:
TagsLITHS: holococcolith, asymmetric, elliptical, rod-shaped, cylindrical, hollow, CA: ca_disjunct, process, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 4->35µm;
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): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of range of species in this database
First occurrence (base): in mid part of Valanginian Stage (54% up, 136.4Ma, in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O

Deflandre, G. (1959). Sur les nannofossiles calcaires et leur systématique. Revue de Micropaléontologie. 2: 127-152. gs

Verbeek, J. W. (1976a). Upper Cretaceous calcareous nannoplankton from Ballon and Théligny in the type area of the Cenomanian stage (Sarthe, France). Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. B79: 69-82. gs


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Lucianorhabdus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-11-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10610 Go to Archive.is to create a permanent copy of this page - citation notes



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