Didymocyrtis tetrathalamus

Classification: rads_cenozoic -> Coccodiscidae -> Didymocyrtis -> Didymocyrtis tetrathalamus
Sister taxa: D. antepenultima, D. avita, D. bassanii, D. didymus, D. laticonus, D. mammifera, D. penultima, D. prismatica, D. tetrathalamus, D. tubaria, D. violina, D. sp.


Citation: Didymocyrtis tetrathalamus (Haeckel 1887) Sanfilippo and Riedel 1980
Rank: species
Basionym: Pannartus tetrathalamus
Taxonomic discussion: (Haeckel)1887 p.378 pl.40 fig 3 as Pannartus;Nigrini 1967 pl.2 figs.4a-d;Sanfili; Sanfilippo & Riedel 1980 p.1010 fig.1g

Catalog entries: Panartus tetrathalamus

Original description: All four chambers of the cortical shell of the same form, size, and structure, kidney-shaped, twice as broad as long. Pores irregular, roundish, twice to three times as broad as the bars; a circle of larger pores at the base of both distal chambers; five to six pores on the half meridian, ten to twelve on the half equator of each chamber. Surface of the cortical shell smooth; its main axis two and a half times as long as the equatorial axis. Both medullary shells spheroidal, compressed, the outer one-third as broad as the constriction. (In the specimen figured spines begin to arise from both distal chambers; this forms a transition to Panartus quadrijugus.)
Remarks on original description: Haeckel listed Panartus tetrathalamus under the subgeneric name Panartella, but did not include the subgeneric name in the species name.[comment from RadWorld database]


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: Lazarus et al. 2015 - "R age group"
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Lazarus et al. 2015 - "R age group"

Plot of occurrence data:


Haeckel, E (1887). Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the year 1873-1876, Zoology. 18: 1-1803. gs

Nigrini, C. A. (1967). Radiolaria in pelagic sediments from the Indian and Atlantic Oceans. Bulletin of the Scripps Institution of Oceanography. 11: 1-125. gs

Sanfilippo, A. & Riedel, W. R. (1980). A revised generic and suprageneric classification of the Artiscins (Radiolaria). Journal of Paleontology. 54(5): 1008-1011. gs


Didymocyrtis tetrathalamus compiled by the radiolaria@mikrotax project team viewed: 15-5-2021

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203953 Go to Archive.is to create a permanent copy of this page - citation notes

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