- Type images:
type material: T. angusta
From Suzuki Paleotax db:
1959 Trigonactura (?) angusta n. sp. Riedel p. 292, pl. 1, fig. 6
1970 Lithocyclia angustum (Riedel) Riedel & Sanfilippo p. 522, pl. 13, figs. 1, 2
1971 Lithocyclia angustum (Riedel) Riedel & Sanfilippo p. 1588, pl. 3a, figs. 1, 2(?), 3
1971 Lithocyclia angusum (Riedel) Moore p. 737, pl. 6, figs. 5, 6
1971 Lithocyclia cf. angustum (Riedel) Riedel & Sanfilippo p. 1646, pl. 3a, fig. 2
1972 Lithocyclia angustum (Riedel) Goll p. 957, pl. 11, fig. 1
1972 Lithocyclia angustum (Riedel) Johnson & Parker pl. 1, fig. 14
1972 Trigonactinium (?) angustum (Riedel) sensu stricto Petrushevskaya & Kozlova p. 524, pl. 17, fig. 3
1973 Lithocyclia angusta (Riedel) Sanfilippo et al. p. 217
1973 Lithocyclia angustum (Riedel) Dinkelman p. 768, pl. 5, figs. 7, 8
1974 Lithocyclia angustum (Riedel) Johnson p. 545, pl. 6, fig. 4
1974 Lithocyclia angustum (Riedel) Nigrini p. 1065, pl. 2A, figs. 4-6
1975 Lithocyclia angust (Riedel) Form A Holdsworth p. 528, pl. 1, figs. 7, 8
1975 Lithocyclia angustum (Riedel) Ling p. 725, pl. 3, figs. 5, 6
1976 Lithocyclia angustum Riedel [sic] Maurrasse & Glass pl. 2, fig. 3
1977 Lithocyclia angusta (Riedel) Riedel & Sanfilippo pl. 11, fig. 12
1978 Lithocyclia angustum (Riedel) Pisias & Moore p. 847, pl. 4, fig. 4
1978 Lithocyclia anusta (Riedel) Riedel & Sanfilippo p. 70, pl. 6, fig. 5
1980 Lithocyclia angusta (Riedel) Sanfilippo & Riedel text-fig. a, b
1985 Lithocyclia angusta (Riedel) Sanfilippo et al. p. 653, figs. 7.3a, 7.3b, 7.3c
1988 Lithocyclia angusta (Riedel) Palmer pl. 2, fig. 3
1995 Lithocyclia angusta (Riedel) Sanfilippo & Nigrini p. 279, pl. 3, figs. 7-9
2012 Lithocyclia angusta (Riedel) Kamikuri et al. pl. 3, fig. 12
Catalog entries: Trigonactura angusta
type material: T. angustaOriginal description: Phacoid cortical shell approximately three times as broad as the medullary shell (when the latter is distinct), with eight to eleven subcircular to circular pores on its radius. Cortical shell in some specimens filled with spongy meshwork. Three arms not strictly chambered, but rather subcylindrical spongy columns, broader at the base and tapered distally. In rare specimens a spongy patagium, its outline parallel to that of the cortical shell, connects the bases of the arms.
Remarks on original description: The placement of this species in the genus Trigonactura is indicated as doubtful because a patagium is present in some specimens, and the medullary shell is not constant in structure; it is rarely if ever a well defined "shell." The arms differ in form from those of any other described members of this genus or closely related genera, probably because they represent a degeneration of the usual larger arms.
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"
Plot of occurrence data:
Riedel, W. R. & Sanfilippo, A. (1970). Radiolaria, Leg. 4 DSDP. Initial Reports of the Deep Sea Drilling Project. 4: 503-575. gs Riedel, W. R. (1959a). Oligocene and Lower Miocene Radiolaria in tropical Pacific sediments. Micropaleontology. 5(3): 285-302. gs Sanfilippo, A., Westberg-Smith, M. J. & Riedel, W. R. (1985b). Cenozoic Radiolaria. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 631-712. gsReferences:
 |
Lithocyclia angusta compiled by the radiolaria@mikrotax project team viewed: 7-10-2026
Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204506 Go to Archive.is to create a permanent copy of this page - citation notes |