rad_org Lithatractus timmsi img1077.jpg
rad_org Lithatractus timmsi img1619.jpg
rad_org Lithatractus timmsi img1620.jpg
rad_org Lithatractus timmsi img1077.jpg
rad_org Lithatractus timmsi img1619.jpg
rad_org Lithatractus timmsi img1620.jpg
1944 Lithatractus timmsi - Campbell and Clark pl. 2, fig. 18-19
1992 Lithatractus timmsi - Lazarus pl. 4, figs. 10-12
From Suzuki Paleotax db:
1944 Lithatractus (Lithatractara) timmsi n. sp. Campbell & Clark p. 18-19, pl. 2, fig. 18
1944 Lithatractus (Lithatractara) timmsi quadrispinus n. var. Campbell & Clark p. 19, pl. 2, fig. 19
1981 Lithatractus timmsi Campbell et Clark Weaver et al. p. 83, pl. 4, figs. 3, 4
1986 Lithatractus timmsi Campbell et Clark Mullineaux & Westbergp. 64, pl. 1, fig. 4
1987 Lithatractus timmsi Campbell et Clark Akers et al. p. 13, pl. 1, figs. 4a-4b
1992 Lithatractus timmsi Campbell & Clark (?) Lazarus p. 796, pl. 4, figs. 10-12
1992 Stylosphaera (?) timmsi (Campbell & Clark) Sugiyama & Furutani p. 203, pl. 12, figs. 3, 4, pl. 15, figs. 1, 2
Catalog entries: Lithatractus timmsi
 timmsi Campbell and Clark 1944.jpg)
type material: L. timmsiOriginal description: Shell rather large, ovoidal, with two prominent, opposite, equal polar spines, which are long (1.23 times long axis of shell), strongly conical (5°), minutely blunted and irregular at tip as if subjected to pressure and compressed (perhaps points of attachment of protoplasmic strands), and swordlike, with four similar, triangular blades with sharp edges, and with bases merged separately on surface of cortical shell, blades at equal angles from each other in two crossed pairs (in our specimen one polar spine was broken off near base, but it is assumed to be duplicate of other); cortical shell generally egg-shaped, its longer axis (vertical axis, in line with polar spines) 1.13 times diameter of minor (transverse) axis, and with sides evenly contoured; medullary shell relatively large (its long axis 0.54 long axis of cortical shell), its transverse axis 0.85 diameter of long axis, and its sides regularly contoured to poles; radial supports (10?), two very strong, prismatic polar, four thinner radials, and four thin transverse, save polar ones, rodlike; pores of cortical shell subuniformly elliptical, only a few odd ones larger and of different form, shallow, narrowly double contoured, well spaced, and about 18 in long axis and 15 in transverse axis, of medullary shell about 10 in long axis and eight or nine in transverse axis, larger and more nearly squarish or subcircular than in cortical shell, deeper set and more widely separated; wall of cortical shell thicker than that of medullary shell; surface of cortical shell slightly roughened with short points.
Remarks on original description: (Lithatractara)
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:
Campbell, A. S. & Clark, B. L. (1944). Miocene radiolarian faunas from southern California. Geological Society of America, Special Papers. 51: 1-76. gs Lazarus, D. (1992). Antarctic Neogene radiolarians from the Kerguelen Plateau, Legs 119 and 120. In, Wise, S. W. Jr. , Schlich, R. et al. (ed.) . Proceedings of the Ocean Drilling Program, Scientific Results . 120: 785-809. gs References:
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Lithatractus timmsi compiled by the radiolaria@mikrotax project team viewed: 30-4-2025
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