radiolaria - rads_cenozoic - Lophocyrtis milowi

Citation: Lophocyrtis milowi (Riedel&Sanfilippo 1971)

Synonyms:
1971 Cyclampterium (?) milowi - Riedel and Sanfilippo p.1593, pl. 3B, fig. 3; pl. 7, figs. 8, 9
1973 Cyclampterium milowi - Sanfilippo and Riedel p. 220, pl. 4, figs. 12-14
1975 Cyclampterium (?) longiventer - Chen p. 459, pl. 10, fig. 7
1975 Cyclampterium (?) milowi - Chen pl. 2, figs. 4, 5
1975 Thyrsocyrtis sp. - Petrushevskaya p. 580, pl. 8, fig. 10
1978 Cyclampterium milowi - Riedel and Sanfilippo p. 67, pl. 4, fig. 14
1990 Cyclampterium milowi - Abelmann pl. 7, fig. 8
1990 Lophocyrtis (Cyclampterium) milowi - Sanfilippo p. 306-307, pl.1, figs. 13-16; pl.2, figs.1-2

From Suzuki Paleotax db:

1971 Cyclampterium (?) milowi n. sp. Riedel & Sanfilippo p. 1593, pl. 3b, fig. 3, pl. 7, figs. 8, 9
1972 Cyclampterium (?) milowi Riedel et Sanfilippo Johnson & Parker pl. 2, fig. 7
1972 Cyclampterium (?) sp. cf. C. (?) milowi Riedel et Sanfilippo Benson p. 1092, pl. 1, figs. 1, 2
1972 Cyclampterium milowi Riedel et Sanfilippo Petrushevskaya & Kozlova p. 548
1973 Cyclampterium (?) milowi Riedel et Sanfilippo Dinkelman p. 776, pl. 2, fig. 1
1973 Cyclampterium (?) milowi Riedel et Sanfilippo Sanfilippo et al. p. 220, pl. 4, figs. 12-14
1975 Cyclampterium (?) milowi Riedel et Sanfilippo Chen p. 460, pl. 2, figs. 4, 5
1975 Cyclampterium (?) milowi Riedel et Sanfilippo Ling p. 731, pl. 12, fig. 15
1975 Cyclampterium milowi Riedel and Sanfilippo Holdsworth p. 529
1977 Cyclampterium milowi Riedel & Sanfilippo Riedel & Sanfilippo pl. 12, fig. 6
1978 Cyclampterium milowi Riedel et Sanfilippo Riedel & Sanfilippo p. 67, pl. 4, fig. 14
1981 Dictyopodium milowi (Riedel et Sanfilippo) Petrushevskaya pl. 2, fig. 14
1983 Cyclampterium (?)sp. aff. C. milowi Riedel et Sanfilippo Weaver p. 675
1986 Cyclampterium milowi Riedel et Sanfilippo Riedel & Sanfilippo pl. 1, fig. 3
1990 Cyclampterium milowi Riedel & Sanfilippo Abelmann p. 696, pl. 7, fig. 8
1990 Lophocyrtis (Cyclampterium) milowi Riedel & Sanfilippo Sanfilippo p. 306-307, pl. 1, figs. 13-16, pl. 2, figs. 1, 2
1992 Cyclampterium (?) milowi Riedel & Sanfilippo Takemura p. 745-746, pl. 5, figs. 1-3

Original description: Shell robust, subcylindrical to campanulate, with the large abdomen bearing three latticed feet. Cephalis subspherical, with few small pores, bearing a short, broadly conical horn. Collar stricture usually pronounced, but less so when the wall of the cephalis is very thick. Thorax hemispherical, thick-walled, with subregular circular pores and surface smooth or slightly thorny. Abdomen subcylindrical or expanding distally, with robust bars separating large pores of variable size. The abdomen passes terminally into three irregular, coarsely latticed feet.

Remarks on original description: [Questionably synonymized with Thyrsocyrtis sp. Petrushevskaya in Petrushevskaya, 1975c, p.580]

Description

Sanfilippo 1990 - Cyclampterium milowi

Description: Three-segmented theoperid with very variable abdomen. Apical spine as long to twice as long as the cephalis. This horn varies in robustness and in later specimens is terminated with a button. The cephalic wall is perforated by 20-30 small subcircular pores, sometimes expressed only as pits on the surface. Collar stricture marked by a distinct change in contour externally and a constriction internally. Thorax approximately hemispherical, with a rough surface and approximately 25 pores on the maximum circumference, arranged quincuncially. The lumbar stricture is marked both internally and externally by a constriction. The subcylindrical to inflated abdomen varies in length. Early in the range the abdomen is short (95-210 ) and later it increases to approximately 300µ. Early forms develop a somewhat coarser meshwork than the ancestor L. (Lophocyrtis) jacchia, but not as coarse as that of later forms, where the abdominal pores are 6-8 times larger than the thoracic ones. A differentiated peristome is never developed. Three subterminal or terminal feet can be short and solid or incipient, latticed with 3-6 pores extending downward from the distal margin of the abdomen.

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

References:

Abelmann, A. (1990). Oligocene to Middle Miocene radiolarian stratigraphy of southern high latitudes from Leg 113, Sites 689 and 690, Maud Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 675-708. gs

Chen, P. H. (1975a). Antarctic Radiolaria. Initial Reports of the Deep Sea Drilling Project. 28: 437-513. gs O

Petrushevskaya, M. G. (1975a). Cenozoic radiolarians of the Antarctic, Leg 29, DSDP. Initial Reports of the Deep Sea Drilling Project. 29: 541-675. gs O

Riedel, W. R. & Sanfilippo, A. (1971). Cenozoic Radiolaria from the western tropical Pacific, Leg 7. Initial Reports of the Deep Sea Drilling Project. 7: 1529-1666. gs

Riedel, W. R. & Sanfilippo, A. (1978). Stratigraphy and evolution of tropical Cenozoic radiolarians. Micropaleontology. 24(1): 61-96. gs

Sanfilippo, A. & Riedel, W. R. (1973). Cenozoic Radiolaria (exclusive of theoperids, artostrobiids and amphipyndacids) from the Gulf of Mexico, Deep Sea Drilling Project Leg 10. Initial Reports of the Deep Sea Drilling Project. 10: 475-608. gs O

Sanfilippo, A. (1990). Origin of the subgenera Cyclampterium, Parampterium and Sciadiopeplus from Lophocyrtis (Lophocyrtis) (Radiolaria, Theoperidae). Marine Micropaleontology. 15(3-4): 287-312. gs

Lophocyrtis milowi

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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