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1970 Cyclampterium ? brachythorax - Sanfilippo and Riedel Plate 2. figures 15-16
1990 Lophocyrtis (Cyclampterium) brachythorax - Sanfilippo Plate IV, figures 4-6
From Suzuki Paleotax db:
1970 Cyclampterium (?) brachythorax n. sp. Sanfilippo & Riedel p. 457, pl. 2, figs. 15, 16
1971 Cyclampterium (?) brachythorax Sanfilippo et Riedel Riedel & Sanfilippo p. 1593, pl. 1e, fig. 7
1972 Cyclampterium (?) brachythorax Sanfilippo et Riedel Goll p. 958, pl. 20, figs. 1-3, pl. 21, figs. 1-3
1977 Cyclampterium brachythorax Sanfilippo & Riedel Riedel & Sanfilippo pl. 19, fig. 16
1978 Cyclampterium brachythorax Sanfilippo et Riedel Riedel & Sanfilippo p. 67, pl. 4, fig. 11
1986 Cyclampterium (?) brachythorax Sanfilippo et Riedel Levyikina p. 86, pl. 9, figs. 2, 3
1986 Cyclampterium brachythorax Sanfilippo et Riedel Riedel & Sanfilippo pl. 5, fig. 15
1990 Lophocyrtis (Cyclampterium) brachythorax Sanfilippo & Riedel Sanfilippo p. 304, pl. 4, figs. 4-6
Catalog entries: Cyclampterium brachythorax
type material: C. brachythoraxOriginal description: Shell moderately robust, approximately oblate-ellipsoidal in over-all form. Cephalis sub-spherical, poreless or with a few small pores. The thorax is broadly conical proximally, then expands rapidly and contracts distally, so that it is 1.5-2 times as broad as it is long. Thoracic pores are circular, regular, increasing in size distally from the slight collar stricture. Thoracic surface thorny. Abdomen rarely preserved, closed, ranging from a slightly convex cap to hemispherical, with pores similar in size to those of the thorax but less regular.
Sanfilippo 1990 - Cyclampterium brachythorax (Plate IV, 4-6) Remarks: Lophocyrtis ( Cyclampterium ) brachythorax is distinguished from L. (C.) neatum (its descendant) and from L. (C.) tanythorax (its ancestor) by its greatly compressed thorax. The transition into and out of L. (C.) brachythorax is rapid and transitional morphotypes are very rare. The original description has been augmented with new measurements based on 20 specimens from DSDP Site 77B Cores 17-20 and Site 289 Cores 26-40. An apical horn isnot present. Total length 220-310 µm; of thorax 125-195 µm; of abdomen 0-145 µm. Maximum width of thorax 240-335 µm; of abdomen 120-250 µm. Number of pores aroundthe maximum circumference of the thorax 44-54. The abdomen(preserved in only a few specimens) is rarely oriented as to enable pores to be counted.L. (C.) brachythorax occurs rarely in the middle Miocene, from its evolutionary origin at the boundary between the Dorcadospyris alata and Diartus petterssoni Zones to its evolutionary transition to L. (C.) neatum in the middle of the Didymocyrtis antepenultima Zone.
Published descriptions
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:
Sanfilippo, A. & Riedel, W. R. (1970). Post-Eocene "closed" theoperid radiolarians. Micropaleontology. 16(4): 446-462. gs Sanfilippo, A. (1990). Origin of the subgenera Cyclampterium, Parampterium and Sciadiopeplus from Lophocyrtis (Lophocyrtis) (Radiolaria, Theoperidae). Marine Micropaleontology. 15(3-4): 287-312. gsReferences:
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Lophocyrtis brachythorax compiled by the radiolaria@mikrotax project team viewed: 30-4-2025
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