Nannotax3 - ntax_mesozoic - Calyculus noeliae

Nannotax3 - ntax_mesozoic - Calyculus noeliae Nannotax3 - ntax_mesozoic - Calyculus noeliae

Calyculus noeliae

Classification: ntax_mesozoic -> Podorhabdales -> Calyculaceae -> Calyculus -> Calyculus noeliae
Sister taxa: C. - late Jurassic ⟩⟨ C. cribrum, C. depressus ⟩⟨ C. noeliae ⟩⟨ C. hommerili, C. serrai ⟩⟨ C. absolutus, C. derivatus, C. magnus, C. sp.

Distinguishing features:
Parent taxon (Calyculus): High, broad, flaring distal-shield composed of radial, non-imbricating elements, and a proximal-shield which is often reduced to a simple, narrow cycle of elements; central-area structures are highly variable, including numerous bars, concentric structures, nets and grills.
This taxon: Calyculus with central area with around 14-20 lateral bars. Rim elevation very variable, even on a single coccosphere

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Taxonomy:

Citation: Calyculus noeliae (Goy, 1979) Crux, 1987

Taxonomic rank: species

Basionym: Vikosphaera noeliae Goy, in Goy et al. 1979

Variants:

Vikosphaera noeliae depressa Goy 1981 = Calyculus noeliae subsp. depressa (Goy 1981) Crux 1987 - low rim
Vikosphaera noeliae recondita Goy 1981 = Calyculus noeliae subsp. recondita (Goy 1981) Crux 1987 - high rim

Goy et al. (1979) showed that these two forms occurred on the same cocccosphere, so it is not logical to describe them as separate taxa.

Farinacci & Howe catalog pages: V. noelae * , V. noelae depressa * , V. noelae recondita *

Morphology:

Collapsed coccospheres suggest that there is considerable variation in coccolith height on single coccospheres and this lead Goy (1979, 1981) to differentiate tall (recondita) and short (depressa) forms, which he termed subspecies.
There are two obvious problems with this. First, it is dificult to defend giving different taxonomic names to two entities produced by a single organism. Second, the presence of these two sub-species automatically implies the existence of a third sub-species C. noeliae subsp. noeliae, which is not in fact defined under Goy's scheme. The best alternative is probably not to use the terms recondita and depressa, but where relevant to note if the elevated or depressed form was observed.

Phylogenetic relations

Thought to be ancestral to Carinolithus superbus

Search data:

LITHS: placolith, elliptical, hollow, CA: grill, ca_disjunct, CROSS-POLARS: V-prominent, rim-unicyclic,

Lith size: 3->6µm;
Data source notes: illustrated specimens

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Toarcian Substage (177.50-184.20Ma, top in Toarcian stage). Data source: Goy et al. 1979
First occurrence (base): within Early Toarcian Substage (177.50-184.20Ma, base in Toarcian stage). Data source: Goy et al. 1979

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Calyculus

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 O

Crux, J. A. (1987a). Concerning dimorphism in Early Jurassic coccoliths and the origin of the genus Discorhabdus Noël 1965. Abhandlungen der Geologischen Bundesanstalt. 39: 51-55. gs

Goy, G. (1981). Nannofossiles calcaires des schistes carbon (Toarcien Inferieur) du Bassin de Paris. Doc. de la RCP 459, Nature et genese des facies confines, (Editions du BRGM). 1: 1-86. gs O

Goy, G., Noël, D. & Busson, G. (1979). Les conditions de sédimentation des schistes-carton (Toarcien inf.) du bassin de Paris déduites de l'étude des nannofossiles calcaires et des diagraphies. Document des Laboratoires de Géologie de la Faculté des Sciences de Lyon. 75: 33-57. gs O

Mattioli, E. (1996). New calcareous nannofossil species from the Early Jurassic of Tethys. Rivista Italiana di Paleontologia e Stratigrafia. 102(3): 397-412. gs

Noël, D. (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle, Paris. 75 [1972]: 95-156. gs

Sandoval, J., et al. (2012). The Toarcian in the Subbetic basin (southern Spain): bio-events (ammonite and calcareous nannofossils) and carbon-isotope stratigraphy. Palaeogeography Palaeoclimatology Palaeoecology. 342-3: 40-63. gs