Published descriptions Dumitricra, in De Wever et al. 2001 -
Spherical Acinommacea without microsphere, with medullary shell consisting exclusively of a macrosphere provide usually with a certain number of centripetal fibrils not coalesing in the centre. With or without cortical shell. Number of radial spines variable. Nucleus spherical, axoplast (? crypto-axoplast) missing in living forms.
Biogeography and Palaeobiology
Biostratigraphic distribution
Geological Range: Last occurrence (top): Extant. Data source: Total of ranges of the species in this database First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database
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. Parent: Actinommidae
References:
Astrosphaeridae compiled by the radiolaria@mikrotax project teamviewed: 8-10-2026
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