Axopodorhabdaceae


Classification: Mesozoic -> Podorhabdales -> Axopodorhabdaceae
Sister taxa: Axopodorhabdaceae, Biscutaceae, Calyculaceae, Cretarhabdaceae, Mazaganellaceae, Prediscosphaeraceae, Tubodiscaceae,

Distinguishing features: Regular placoliths; central-area, with cross-bars or perforated plate; often with tall, hollow spines.
Distal shield elements non-imbricate V-units; proximal shield and inner cycle formed from R-units. Rim often appears beaded in LM


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Elliptical; central area with axial cross and tall spine

Subcircular with very high rim; central-area narrow, with grill.

Elliptical to subrectangular; central-area with coarsely-perforate net.

Elliptical; central area with one cycle of about 12 perforations and central hollow spine

Ellpitical, rim narrow rim; central area wide, spanned by multiperforate net, with or without axial cross and spine.

Elliptical; central area narrow, spanned by a transverse bar.

Elliptical; central area spanned by six broad bars delineating six large perforations, including one at each end of the central area. Central hollow spine.

Reniform; central-area net with two to numerous pores

Elliptical; central area spanned by eight bars delineating eight large perforations arranged either side of the long axis.

Eliptical; central area spanned by eight bars that delineate eight large perforations. Central hollow spine.

Elliptical; central area with one or two cycles of perforations and central hollow spine

Elliptical, rim broad; central area spanned by a granular bar supporting a broad, tall, hollow, flaring spine.

Similar to Cribrosphaerella but with perforations only in centre of central area



Ellptical; central area with diagonal cross or offset crossbars bars, supporting hollow spine

Taxonomy:

Citation: Axopodorhabdaceae Wind & Wise in Wise & Wind, 1977
Rank: Family
Type species: Axopodorhabdus Wind and Wise in Wise and Wind, 1977.

Farinacci & Howe catalog pages: Axopodorhabdaceae [no catalog entry yet]

Distinguishing features: Regular placoliths; central-area, with cross-bars or perforated plate; often with tall, hollow spines.
Distal shield elements non-imbricate V-units; proximal shield and inner cycle formed from R-units. Rim often appears beaded in LM


Morphology remarks: Placoliths with two shields and a central-area, spanned by axial cross-bars or granular plates with variable numbers of perforations; the central structure generally supports tall, hollow spines. The distal shield is formed from V-unit elements joined along radial or near-radial sutures that show little or no imbrication. The proximal shield and inner cycle (if present) are formed from R-units. LM image is generally dark, but bright inner-cycles may be visible. The image is characterised by clearly visible shield elements, often giving a 'beaded' appearance around the inner edge of the shields.
The informal term podorhabdid is useful and widely used to described the coccoliths classified together in the Axopodorhabdaceae.

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian 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. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs

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

GrĂ¼n, W. & Allemann, F. (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae. 68: 147-211. gs

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs


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Axopodorhabdaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-12-2019

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