Daughter taxa: (blue => in age window 0-800Ma) | ||||
very small (~3μm), circular with raised distal collar and tall proximal shield | ||||
small (<5μm), circular with relatively wide central area; | ||||
![]() | ![]() | ![]() | small (<5μm), circular with relatively wide central area spanned by cross bars | |
medium-sized (5–9μm), circular to subcircular with relatively wide central area | ||||
medium to large, subcircular to circular with narrow central area | ||||
medium to large (~6–11μm), subcircular to circular; moderately broad upper-tube cycle and narrow central area; | ||||
![]() | large (>9μm), circular with wide central area; | |||
Specimens which cannot be assigned to any established species |
Taxonomy:
The genus Diadelithus Aubry & Bord (2009) probably should be used instead, since the type species is E. robusta. However, as described Diadelithus includes a rather different set of species and so the genus would need to be emended, and new combinations proposed [JRY 2016]
Distinguishing features: Coccolithus-like coccoliths that are typically circular and have broad upper tube elements that dominate the distal shield. The dominance of the R-unit cycle results in a bright LM XPL image that is distinct from Coccolithus.
Farinacci & Howe catalog pages: Ericsonia + * , Diadelithus *
Search data:Tags | LITHS: placolith, circular, RIM: inner-tube-broad, psh-bicyclic, CA: vacant, CSPH: spherical, monomorphic, V-UNITS: distal shield, px-tube, R-UNITS: ds-tube, prox shield, DETAILS: rim-bicyclic, isogyres oblique, |
Metrics | Lith size: 5->12µm; Sources: |
Geological Range:
Last occurrence (top): in lower part of Rupelian Stage (17% up, 32.9Ma, in Rupelian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Danian Stage (42% up, 64.2Ma, in Danian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Aubry, M. -P. & Bord, D. (2009). Reshuffling the cards in the photic zone at the Eocene/Oligocene boundary. In, Koeberl, C. & Montanari, A. (eds) The Late Eocene Earth—Hothouse, Icehouse, and Impacts. Geological Society of America Special Paper. 452: 279-301. gs Black, M. (1964). Cretaceous and Tertiary coccoliths from Atlantic seamounts. Palaeontology. 7: 306-316. gsReferences:
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Ericsonia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-12-2019
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