arrayname: original
Distinguishing features:
Parent taxon (Parhabdolithaceae): Murolith (protolith type) coccoliths with bicylic rims and central-areas spanned by an axial-cross or transverse bar bearing a broad, often long, spine.
This taxon: Protolith coccoliths with low, sloping rim; central area wide with a multiperforate net that may incorporate spine-bearing axial cross bars.
Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | ![]() | Diductius constans Coccoliths with a low, narrow, sloping protolith rim and a wide central area with a multiperforate net that may incorporate spine-bearing axial cross bars. Bicyclic rim image in XPL. | ||
Diductius sp. Specimens not identified to species level |
Taxonomy:
Farinacci & Howe catalog pages: Diductius *
Distinguishing features:
Parent taxon (Parhabdolithaceae): Murolith (protolith type) coccoliths with bicylic rims and central-areas spanned by an axial-cross or transverse bar bearing a broad, often long, spine.
This taxon: Protolith coccoliths with low, sloping rim; central area wide with a multiperforate net that may incorporate spine-bearing axial cross bars.
Morphology:
LITHS: murolith, elliptical, CA: cross-axial, grill, process, ca_disjunct, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic, |
Lith size: 4->7µm; Data source notes: size range of included species |
See also: Thurmannolithion - rather similar genus in the Stephanolithiaceae;
Geological Range:
Last occurrence (top): at top of NJ9 zone (100% up, 170.1Ma, in Bajocian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Early Toarcian Substage (177.50-184.20Ma, base in Toarcian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
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 Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. 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. gs OReferences:
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Diductius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-3-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10375 Go to Archive.is to create a permanent copy of this page - citation notes |
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