Distinguishing features: Parent taxon (Calyculaceae): Elevated placoliths, tube tall and proximal shield reduced; central-area with variable proximal cover.
The distal shield is formed from V-units and the proximal shield from R-units. Commonly observed in side view. This taxon: 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.
Daughter taxa (time control age-window is: 0-800Ma)
Proculithus Medd, 1979 [according to Bown 1987, p. 40]
Incerniculum Goy, 1979 [according to Bown 1987, Crux 1987]
Vikosphaera Goy, 1979 [according to Bown 1987, Crux 1987]
Catillus Goy, 1979 [according to Bown 1987, Crux 1987]
The genera Proculithus, Incerniculum, Vikosphaera and Catillus were proposed based on variations in central area structure, Bown (1987) and Crux (1987) both argued that this was impractical, and that such characters were better used at specific level. Nonetheless, it is useful to sort the species out into the categories proposed by Goy in order to understand the taxonomy - this is what I have done in the table [JRY]
Distinguishing features: Parent taxon (Calyculaceae): Elevated placoliths, tube tall and proximal shield reduced; central-area with variable proximal cover.
The distal shield is formed from V-units and the proximal shield from R-units. Commonly observed in side view. This taxon: 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.
Morphology: Species are often difficult to differentiate in LM because the distinctive central area structures may be imperceptible or missing.
Lith size: 3->8µm; 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 Oxfordian Stage (100% up, 154.8Ma, in Oxfordian stage). Data source: Total of ranges of the species in this database First occurrence (base): within Late Pliensbachian Substage (184.20-188.00Ma, base in Pliensbachian stage). Data source: Total of ranges of species in this database
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
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Calyculaceae
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. gsO
Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs
Bown, P. R. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 1-118. gs
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., 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. gsO
Medd, A. W. (1979). The Upper Jurassic coccoliths from the Haddenham and Gamlingay boreholes (Cambridgeshire, England). Eclogae Geologicae Helvetiae. 72: 19-109. gsO
Noël, D. (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle, Paris. 75 [1972]: 95-156. gs
Calyculus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-4-2025
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Micaela Chaumeil Rodríguez
6
Aug 2020
Micaela Chaumeil Rodríguez(Argentina)
Dear Jeremy,
The original diagnosis of Calyculus and Calyculus cribum is in Noël D., 1972 not 1973.
In the Farinacci & Howe catalog the genus and the species author appears as Noël, 1972.
The publication is the same for L. barozii (I have sent a comment about it a minute ago).
Kind regards,
Mica
Jeremy Young
551
Jan 2017
Jeremy Young(UK)
Hi Mica - the paper was actually published in 1973 even though the cover date is1972, for taxonomy we need use the correct date. I discuss this a bit further in my reply to your other comment
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Comments (2)
Dear Jeremy,
The original diagnosis of Calyculus and Calyculus cribum is in Noël D., 1972 not 1973.
In the Farinacci & Howe catalog the genus and the species author appears as Noël, 1972.
The publication is the same for L. barozii (I have sent a comment about it a minute ago).
Kind regards,
Mica
Hi Mica - the paper was actually published in 1973 even though the cover date is1972, for taxonomy we need use the correct date. I discuss this a bit further in my reply to your other comment
Jeremy