rad_org Lophocyrtis tanythorax img2795.jpg
rad_org Lophocyrtis tanythorax img2796.jpg
rad_org Lophocyrtis tanythorax img2797.jpg
rad_org Lophocyrtis tanythorax img2798.jpg
rad_org Lophocyrtis tanythorax img2799.jpg
rad_org Lophocyrtis tanythorax img2794.jpg
1970 Cyclampterium ? tanythorax - Sanfilippo and Riedel Plate 2, figures 13-14
1990 Lophocyrtis ( Cyclampterium ) tanythorax - Sanfilippo Plate 4, figures 7-10
From Suzuki Paleotax db:
1970 Cyclampterium (?) tanythorax n. sp. Sanfilippo & Riedel p. 457, pl. 2, figs. 13, 14
1971 Cyclampterium (?) tanythorax Sanfilippo et Riedel Riedel & Sanfilippo p. 1593, pl. 1e, figs. 8-10, pl. 2d, figs. 7, 8
1972 Cyclampterium (?) tanythorax Sanfilippo et Riedel Goll p. 959, pl. 26, figs. 1-4
1972 Cyclampterium tanythorax Sanfilippo et Riedel Johnson & Parker pl. 2, fig. 10
1975 Cyclampterium tanythorax Sanfilippo et Riedel Holdsworth p. 530
1986 Cyclampterium (?) tanythorax Sanfilippo et Riedel Levyikina p. 85-86, pl. 9, fig. 1
1986 Cyclampterium tanythorax Sanfilippo et Riedel Riedel & Sanfilippo pl. 1, fig. 5
1990 Lophocyrtis (Cyclampterium) tanythorax Sanfilippo & Riedel Sanfilippo p. 307, pl. 4, figs. 7-10
1992 Lophocyrtis (Cyclampterium) sp. cf. L. (C.) tanythorax (Sanfilippo & Riedel) Sugiyama & Furutani p. 209-210, pl. 17, fig. 8
Catalog entries: Cyclampterium tanythorax
type material: C. tanythoraxOriginal description: Shell robust, subspherical to subellipsoidal in general form. Cephalis subspherical, poreless or with a few small pores, commonly with a short apical horn. Collar stricture pronounced. Thorax inflated, thick-walled. with rather regular circular pores increasing in size away from the collar stricture, and a thorny surface. Abdomen thick-walled, with subcircular pores less regular than those of the thorax, always closed distally, ranging in form from a slightly convex cap to inflated, more than hemispherical. There are no feet, but in some specimens a few short, irregularly scattered subterminal spines.
Sanfilippo 1990 - Cyclampterium tanythorax (Plate IV, 7-10) Remarks: Lophocyrtis ( Cyclampterium ) tanythorax has an inflated, thick-walled thorax. In some specimens the thickened wall is tuberose proximally(Plate IV, 7). The closed abdomen ranges from a small cap to inflated, more than hemispherical(Plate IV, 7-9). The abdominal pores vary in size from small, irregularly arranged, up to four times as large as the thoracic pores. Irregularly scattered subterminal spines are present in some specimens(Plate IV, 8).New observations on 30 specimens from DSDP Site 77B Cores 23-26; Site 217 Core 4; Site 289 Cores 43-54 and Site 315A Core 5 have made it easier to distinguish this species from its ancestor and descendant. A short apical horn or a thickened cap is commonly present. Total length (excluding horn and subterminal spines) 290-380 µm, length of thorax 185-235 µm, of abdomen 60-245 µm. Maximum width of thorax 235-315 µm, of abdomen 170-345 µm. Number of pores around the maximum circumference of thorax 44-54 µm, of abdomen 24-30 µm. L. (C.) tanythorax occurs in moderate abundance from its evolutionary origin near the middle of the Calocycletta costata Zone to its transition into L. (C.) brachythorax near the boundary between the Dorcadospyris alata and Diartus petterssoni Zones, early to middle Miocene.
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:
 |
Lophocyrtis tanythorax compiled by the radiolaria@mikrotax project team viewed: 10-12-2024
Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204600 Go to Archive.is to create a permanent copy of this page - citation notes |