Larnacantha polyacantha Campbell and Clark 1944.jpg
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Larnacantha polyacantha Campbell and Clark 1944.jpg<% linkedspecs %>
Current identification/main database link: Larcopyle polyacantha (Campbell and Clark) Lazarus et al. 2005
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. Distinguishing characters (rw): Larnacantha polyacantha n. sp. differs from described species most prominently in peculiar polar bunching of longer radial spines and in its narrowed cortical shell which is less stout than in other forms. One of more abundant species in this collection.
Editors' Notes
[New name for part of Lithocarpium polyacantha (Campbell and Clark), other part questionably synonymized with Lithocarpium fragilis (Stöhr) in Petrushevskaya 1975c]
Campbell, A. S. & Clark, B. L. (1944a). Miocene radiolarian faunas from southern California. Geological Society of America, Special Papers. 51: 1-76. gs Petrushevskaya, M. G. (1975a). Cenozoic radiolarians of the Antarctic, Leg 29, DSDP. Initial Reports of the Deep Sea Drilling Project. 29: 541-675. gsReferences:
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Larnacantha polyacantha compiled by the radiolaria@mikrotax project team viewed: 18-1-2021
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