Citation: Rhomboaster cuspis Bramlette & Sullivan, 1961taxonomic rank: SpeciesVariants: Marthasterites riedeli Brönnimann & Stradner (1960) - similar but with pores in the raysTaxonomic discussion: Regarded as a variant of R. bramlettei by Bybell & Self-Trail (1995)
Distinguishing features: Parent taxon (Rhomboaster): Solid nannoliths that include rhombic, rhombic with spinose extensions and forms composed of two superimposed tri-radiate cycles. This taxon: Rhombic Rhomboaster nannoliths with little or no extensions from the points of the rhomb.
Lith size: 5->10µm; Segments: 8->8; Data source notes: lith size from OD & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range: Notes: Almost confined to the PETM. Last occurrence (top): near base of NP10 zone (5% up, 55.8Ma, in Ypresian stage). Data source: Agnini et al. 2007 fig 8, 9 First occurrence (base): at top of NP9 zone (95% up, 55.9Ma, in Ypresian stage). Data source: Agnini et al. 2007 fig 8, 9
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
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Rhomboaster cuspis, synonyms included - Rhomboaster cuspis;
Agnini, C., Fornaciari, E., Raffi, I., Rio, D., Rohl, U. & Westerhold, T. (2007a). High-resolution nannofossil biochronology of middle Paleocene to early Eocene at ODP Site 1262: Implications for calcareous nannoplankton evolution. Marine Micropaleontology. 64: 215-248. gs
Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gsO
Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31(1): 11-38. gsO
Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs
Bybell, L. M. & Self-Trail, J. (1995). Evolutionary, biostratigraphic and taxonomic study of calcareous nanofossils from a continuous Palaeocene-Eocene boundary section in New Jersey. U.S. Geological Survey, Professional Paper. 1554: 1-36. gsO
Müller, C. (1979). Calcareous nannofssils from the North Atlantic (Leg 48). Initial Reports of the Deep Sea Drilling Project. 48: 589-639. gs
Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 36(1): 33-59. gsO
Rhomboaster cuspis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-10-2024
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