CATALOG OF ORIGINAL DESCRIPTIONS: Pentactinosphaera Nagata & Nishimura, in Nakaseko et al. 1983

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Pentactinosphaera codonia Renaudie & Lazarus 2013

Pentactinosphaera

Citation: Pentactinosphaera Nagata & Nishimura, in Nakaseko et al. 1983
Rank: genus
Type species: Melittosphaera hokurikuensis Nakaseko 1955 (monotypic)
Described on page(s) : 32

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Current identification/main database link: Pentactinosphaera Nagata and Nishimura, in Nakaseko et al. 1983


Original Description
Entirely globular, thick-walled shell with the pentactine spicule at the apical end and a spine at the antapical one, these hexactine spicule inserted in the latticed shell. The structure of the spicule shows text-figure 1.

Extra details from original publication
Pentactinosphaera n. gen. has quite similar internal skeleton to Pentactinocarpus Dumitrica, but the former is distinguished from the latter by having a outer shell, in addition by that the four lateral spines originate from not the basal ones but their intermediate. This new genus differs from Lobactinocapsa Dumitrica in having the entirely globular outer shell and only six radial spines. Pentactinosphaera is similar to two recent genera, Heliaster and Tetrapetalon, described by Hollande and Enjumet (1960) in having a spherical outer shell and inner shell with pentactine spicule, but the former differs from the latter in lacking radial spines outside outer shell and in having the thick-walled outer shell and only six radial beams. Dumitrica described the Subfamily Pentactinocarpinae from Triassic in Romania and Italy. From Miocene sediments in Japan was found the form belonging to the same subfamily. Dumitrica pointed out that the foregoing two recent genera (Heliaster and Tetrapetalon) possess quite similar microsphere to Pentactinocarpinae. It thus appears that the discovery of the Neogene species belonging to the Subfamily Pentactinocarpinae is greatly significant on the consideration of the evolution of this subfamily. Only one species was encountered.

Stratigraphic range: Early to Middle Miocene.

Editors' Notes
[Nomen nudum ? in Nakaseko, Nagata and Nishimura, 1982, p. 70] [Junior synonym of NANINA]


References:

Nakaseko, K., Nagata, K. & Nishimura, A. (1982). Discovery of Miocene Radiolaria belonging to Pentactinocarpinae in Japan (Preliminary Report). News of Osaka Micropaleontologists, Special Volume. 5: 423-425. gs

Nakaseko, K., Nagata, K. & Nishimura, A. (1983). Pentactinosphaera hokurikuensis (Nakaseko): a revised Early Miocene Radiolaria. Science Reports, College of General Education, Osaka University. 32: 31-37. gs


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Pentactinosphaera compiled by the radiolaria@mikrotax project team viewed: 21-1-2021

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