rad_org Pentactinosphaera hokurikuensis img2247.jpg
rad_org Pentactinosphaera hokurikuensis img2248.jpg
rad_org Pentactinosphaera hokurikuensis img2249.jpg
rad_org Pentactinosphaera hokurikuensis img2250.jpg
rad_org Pentactinosphaera hokurikuensis img2251.jpgCatalog entries:
Nakaseko et al 1983 - Melittosphaera hokurikuensis Emended description: Outer shell globular, thick-walled with rough surface frequently arising bristle-like short by-spines along the wall inside cylindrical pores. Inner wall of outer shell quite smooth with round pores. Some specimens seem to consist of double outer shells by the wall structure of broken shell (see pl.l, fig. 3). Inner shell nearly spindle shaped with distinct four openings composed of five spines at the apical portion. Four lateral spines originate from the intermediate of four basal spines and extend to the wall inside outer shell. On the opposition of apical portion there is latticed shell composed of delicate, thorny bars with an antapical spine. Six spines connect to the outer shell as radial beams. They are rod-like, thorny except the antapical spine and slightly curved. Remarks: This species is variable in size of outer shell and thickness of the wall, however, the internal skeleton is always the same. As mentioned above, the wall structures of some specimens appear to consist of double outer shells. It is, however, uncertain herein whether it is due to the process of the growth of the same species or shows quite different species.
Published descriptions
Similar species
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:
Kozur, H. & Mostler, H. (1982). Entactinaria subordo nov., a new radiolarian suborder. Geologisch-Paläontologische Mitteilungen Innsbruck. 11-12(1): 399-414. 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., 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., Mizutani, S. & Yao, A. (1983). Radiolarian fossils and Mesozoic geology of the Japanese Islands. Kagaku (Science). 53(2): 177-183. gsReferences:
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Pentactinosphaera hokurikuensis compiled by the radiolaria@mikrotax project team viewed: 21-6-2025
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