Catalog entries: Lithocarpium monikae
Original description: Outer gown with meshes 5-10µm in diameter. The diameter of entire skeleton about 150-250µm. The central mass (or spiral?) looks very similar to that in L. fragilis although L. monikae differs from L. fragilis. The latter have no pronounced radial spines (or rods), and the space between the central mass and the outer gown in L. fragilis is filled with irregular meshes (Plate 4, Figures 3, 4). In L. monikae the construction is similar to that in Rhizosphaeridae: there are radial spines connecting central mass and external layer. Distinguishing characters (rw): L. monikae differs from Rhizosphaerids by having another external shell (or gown) with pylom. L. monikae resembles Plegmosphaera maxima Haeckel by the thin outer skeletal layer (the difference is the absence of the internal mass in P. maxima). In the same way L. fragilis is similar to Plegmosphaera exodictyon Haeckel (1887, pl. 18, fig. 8). They have a nearly identical thick peripheral skeleton composed of irregular meshes (the difference is the absence of the internal mass in P. exodictyon). It is difficult to say if there is real connection between Lithocarpium species and Plegmosphaerids. L. monikae differs from L. titan by having a thinner, less regular, even spongy outer surface of the skeleton, and straight radial spines.
Remarks on original description: Description is based on 26 specimens.
Similar species: monikae
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"
Plot of occurrence data:
Prunopyle monikae compiled by the radiolaria@mikrotax project team viewed: 2-3-2021
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