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1955 Thecosphaera (Thecosphaera) miocenica - Nakaseko p.73; pl.2, fig.1a-b
1971 Thecosphaera miocenica - Nakaseko p.60; pl.1, figs.1a-b
1974 Thecosphaera miocenica - Nakaseko and Nishimura p.48; pl.1, fig.7a-b
1996 Thecosphaera miocenica - Motoyama p.252; pl.2, fig.4a-b
From Suzuki Paleotax db:
1955 Thecosphaera (Thecosphaera) miocenica n. sp. Nakaseko p. 73-74, pl. 2, fig. 1a, 1b
1959 Thecosphaera (Thecosphaera) miocenica Nakaseko Nakaseko p. 7-8, pl. 2, fig. 3
1964 Thecosphaera miocenica Nakaseko Kanomata & Iwashita p. 70, pl. 2, fig. 8, pl. 3, fig. 1
1964 Thecosphaera miocenica Nakaseko Nakaseko p. 43-44, pl. 1, fig. 6a, 6b, pl. 2, fig. 4a, 4b
1972 Thecosphaera miocenica Nakaseko Nakaseko p. 60-61, pl. 1, fig. 1a, 1b
1973 Thecosphaera miocenica Nakaseko Nakaseko & Sugano pl. 2, fig. 2a, 2b
1975 Thecosphaera miocenica Nakaseko Nakaseko & Nishimura p. 48, pl. 1, fig. 7a, 7b
1976 Thecosphaera miocenica Nakaseko Sugano p. 22, pl. 4, fig. 7a, 7b
1976 Thecosphaera miocenica Nakaseko Takayanagi et al. pl. 2, fig. 7
1978 Thecosphaera miocenica Nakaseko Sugano & Nagata pl. 1, fig. 5a, 5b
1982 Thecosphaera miocenica Nakaseko Nagata & Ichinoseki pl. 1, fig. 3
1982 Thecosphaera miocenica Nakaseko Nagata pl. 1, figs. 3a, 3b
1982 Thecosphaera miocenica Nakaseko Nagata pl. 2, fig. 7
1982 Thecosphaera miocenica Nakaseko Sakai p. 192, pl. 96, fig. 890
1984 Thecosphaera miocenica Nakaseko Chitoku pl. 1, figs. 4a, 4b
1987 Thecosphaera miocenica Nakaseko Watanabe pl. 5, fig. 3
1996 Thecosphaera miocenica Nakaseko Motoyama pl. 2, fig. 4
Catalog entries: Thecosphaera miocenica
 miocenica Nakaseko 1955.jpg)
type image: T. miocenicaOriginal description: Shell entirely globular, spiny, and with three concentric spheres in the ratio of 0.27, and 0.12 diameter of the outer shell respectively ; cortical shell with moderately thick wall, surface with about 16 18 pores across the diameter ; these pores fairly small, circular or subcircular, more or less uniform in size, deeply set, and with the subhexagonal frames; surface of the cortical shell spiny, its spines extremely short, arising at each node of the subhexagonal meshworks ; secondary medullary shell with about seven pores across the diameter, its pores circular, uniform in size, well spaced, and thick bars connected with the cortical shell by means of six beams ; primary medullary shell very small.
Nakaseko 1971 - Thecosphaera miocenica Description : Shell entirely globular, with rather smooth surface, and with three concentric spheres; outer shell with moderately thick wall, surface with about 18 20 pores across the diameter; its pores fairly small, circular, regular in arrangement, uniform in size and shape, and with hexagonal frames; secondary inner shell about 0.3 of the outer shell in diameter, with about 8 pores across the diameter; its pores circular, uniform in size, well-spaced, and with thin bars; primary inner shell very small, about 0.15 of the outer shell in diameter; three spheres connected by radial beams, its beams thin, rodlike, about 10 in number. Measurements: -Diameter of the outer shell, 130-170µ; of the secondary inner shell, 35-45µ; of the primary inner shell, 15-20µ. Remarks: -The species was reported by the writer from the Joyama formation (middle Miocene) in Toyama Prefecture. It occurs abundantly in the Japanese Miocene formations, and is the characteristic or represented species of the Ta-Ar assemblage. This species is similar in having inner shell noticeably smaller than outer shell to Thecosphaera californica which was recorded by Campbell and Clark from the Eocene formation of California, but differs from the latter in having smaller outer shell and hexagonal frames. It is distinguishable from Thecosphaera japonica as described under that species by that the pores of the outer shell is larger in number, and the diameter of the inner shell is smaller.
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:
Motoyama, I. (1996). Late Neogene radiolarian biostratigraphy in the subarctic Northwest Pacific. Micropaleontology. 42(3): 221-262. gs Nakaseko, K (1955). Miocene radiolarian fossil assemblage from the southern Toyama Prefecture in Japan. Science Reports, South and North Colleges, Osaka University Osaka. 4: 65-127. gs Nakaseko, K (1971a). On some species of the genus Thecosphaera from the Neogene formations, Japan. Science Reports, College of General Education, Osaka University. 20(2): 59-66. gs Missing or ambiguous references: Nakaseko & Nishimura 1974; References:
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Thecosphaera miocenica compiled by the radiolaria@mikrotax project team viewed: 6-10-2024
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