Distinguishing features: Parent taxon (Rhombolithion): Diamond-shaped; rim unicyclic (stradnerlithids). This taxon: Rhombolithion with central area spanned by diagonal bars.
Citation: Rhombolithion minutum (Rood et al., 1971) Young & Bown 2014 Rank: SpeciesBasionym: Diadorhombus minutus Rood et al., 1971Taxonomic discussion: Transferred from Rhombolithion by Young & Bown (2014) since the wall structure indicates it should be in the Stephanolithaceae not the Chiastozygaceae.
Geological Range: Last occurrence (top): within Oxfordian Stage (157.25-163.47Ma, top in Oxfordian stage). Data source: original description - real range probably longer First occurrence (base): within Oxfordian Stage (157.25-163.47Ma, base in Oxfordian stage). Data source: original description - real range probably longer
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: Rhombolithion
Rood, A. P. & Barnard, T. (1972). On Jurassic coccoliths: Stephanolithion, Diadozygus and related genera. Eclogae Geologicae Helvetiae. 65: 327-342. gsVO
Rood, A. P., Hay, W. W. & Barnard, T. (1971). Electron Microscope Studies of Oxford Clay Coccoliths. Eclogae Geologicae Helvetiae. 64: 245-272. gsO
Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. gsVO
Rhombolithion minutum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-1-2023