radiolaria - rads_cenozoic - Spongoplegma variabile

Citation: Spongoplegma variabile Nakaseko 1971

Basionym: Spongoplegma variabile

Synonyms:
1971 Spongoplegma variabilium - Nakaseko p.54; pl.1, figs.1a-3
1974 Spongoplegma variabile - Nakaseko and Nishimura p.49; pl.2, fig.4a-b

From Suzuki Paleotax db:

1972 Spongoplegma variabilium n. sp. Nakaseko p. 54, pl. 2, fig. 1a, 1b, 2, e
1973 Spongoplegma variabilium Nakaseko Nakaseko & Sugano pl. 2, fig. 1a, 1b
1975 Spongoplegma variabile Nakaseko [Latin correctum] Nakaseko & Nishimura p. 49, pl. 2, fig. 4a, 4b
1976 Spongoplegma variabile Nakaseko Nakaseko & Sugano pl. 4, fig. 2
1976 Spongoplegma variabile Nakaseko Sugano p. 21-22, pl. 4, fig. 6a, 6b, 6c
1976 Spongoplegma variabilum Nakaseko [sic] Takayanagi et al. pl. 2, fig. 8
1977 Spongoplegma variabilium Nakaseko [sic] Oda & Sakai pl. 4, fig. 3
1978 Spongoplegma variabile Nakaseko Sugano & Nagata pl. 2, fig. 1a, 1b
1979 Rhizosphaera variabilium (Nakaseko) Kozlova & Petrushevskaya p. 94, fig. 217
1982 Spongoplegma variabile Nakaseko et Nishimura [sic] Nagata pl. 3, fig. 10
1982 Spongoplegma variabilium Nakaseko Sugano pl. 1, fig. 4
1983 Spongoplegma variabile Nakaseko Takemura & Hirota pl. 1, fig. 13
1992 Rhizosphaera aff. variabilum (Nakaseko) Gladenkov & Devyatkin pl. 32, fig. 2
1992 Spongoplegma variabilium Nakaseko [sic] Sugiyama & Furutani p. 201, pl. 15, figs. 5, 9a-10
1993 Rhizosphaera variabilium (Nakaseko) Vituchin pl. 26, fig. 10

Taxonomic discussion: (Nakaseko)

Original description: Cortical shell large, spherical, with a rough surface; its shell consists of a single lattice plate, but has a spongy frameworks in very small area; pores of the cortical shell usually well spaced, circular or subcircular, irregular in size and shape, about 15 20 across diameter; its bars vary in thickness, bearing very short thorns on each nodal points; wall of the shell fairly thick. Numerous radial beams connect the cortical shell to a small and subspherical medullary shell, become forked and compose by communication of lateral branches; its texture of the inner shell similar to that of secondary medullary shell at a glance. The medullary shell present as Nigrini pointed out, small in size, subspherical; its pores small, well spaced, hexagonal or subhexagonal, similar in size, with thin bars.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

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"

References:

Nakaseko, K (1971b). On the Spongoplegma antarcticum Haeckel. Science Reports, College of General Education, Osaka University. 20(2): 51-55. gs

Missing or ambiguous references: Nakaseko & Nishimura 1974;

Spongoplegma variabile

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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