radiolaria - rads_cenozoic - Rhizoplegma densum radiolaria - rads_cenozoic - Rhizoplegma densum

Rhizoplegma densum


Classification: rads_cenozoic -> Actinommidae -> Actinommidae inc sed -> Rhizoplegma -> Rhizoplegma densum
Sister taxa: R. boreale, R. densum, R. sp.

Taxonomy

Citation: Rhizoplegma densum Blueford 1982
Taxonomic rank: species
Basionym: Rhizoplegma densum
Synonyms:
1982 Rhizoplegma densum - Blueford Pl. 3, fig. 7

From Suzuki Paleotax db:

1982 Rhizoplegma densum n. sp. Blueford p. 196, pl. 3, fig. 7

Catalog entries: Rhizoplegma densum

Original description: Two shells, 160-240 and 40-60 µ in diameter. Outer surface dense, spongy layer of varying thickness (20-120 µ), by-spiny. Five to eight spines radiating from inner shell, bladed with serrated edges with budlike branches; unbroken spines 400 µ in length. Pores of outer shell extremely variable in size and shape, forming irregular meshwork. Inner shell delicate, with irregular pores.
Remarks on original description: The paucity of specimens at Site 77 and their absence at Site 289 suggest that this species is selectively dissolved or endemic to eastern Pacific equatorial waters. Examination of Site 66 confirms the conclusion that Rhizoplegma densum is endemic to the eastern part.[comment from RadWorld database]

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"

Plot of occurrence data:

References:

Blueford, R (1982). Miocene actinommid Radiolaria from the equational Pacific. Micropaleontology. 28(2): 189-213. gs


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Rhizoplegma densum compiled by the radiolaria@mikrotax project team viewed: 13-5-2025

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=205284 Go to Archive.is to create a permanent copy of this page - citation notes



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