Original description: Shell moderately large, lentelliptical (1.74 its diameter in length), and with two medullary shells, innermost of which is oval, and in which surface of cortical shell is armed with spines which are numerous, short (longest 21?m, smaller ones half as much), generally conical, freely scattered over surface and especially bunched at two opposite narrowed poles of shell where they are longest, straight or curved, sometimes bifurcated, and arising as sepaloid points from subhexagonal meshwork; cortical shell simple, but medullary shell doubled, innermost of latter oval, outermost and cortical shell both lentelliptical, inner medullary shell about 0.5 diameter of outer one, and latter 0.55 diameter (long axis) of cortical shell, two inner shells smooth and thin-walled; radial beams very numerous (at least as many as surface spines with which they appear to connect on inner side of cortical shell) generally thin, wirelike rods; surface of cortical shell with strong, coarse, subhexagonal meshwork, each pore enclosed by a deep funnel, from free angles of which arise surface spines; cortical pores subcircular to subelliptical, sometimes oddly shaped, nearly uniform in size (generally 4.4-10µm in diameter), some of them in fused pairs.
Length of cortical shell, 180µm, of outer medullary shell, 109µm, of inner medullary shell, 51µm. Remarks on original description: [New name for part of Lithocarpium polyacantha (Campbell and Clark), other part questionably synonymized with Lithocarpium fragilis (Stöhr) in Petrushevskaya 1975c]
Description
Biogeography and Palaeobiology
Similar speciespolyacantha
Biostratigraphic distribution
Geological Range: Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group" First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"
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
Lazarus, D., Faust, K. & Popova-Goll, I. (2005). New species of prunoid radiolarians from the Antarctic Neogene. Journal of Micropalaeontology. 24(2): 97-121. gs
Larcopyle polyacantha compiled by the radiolaria@mikrotax project teamviewed: 29-11-2023
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