Didymocyrtis mammifera


Classification: rads_cenozoic -> Coccodiscidae -> Didymocyrtis -> Didymocyrtis mammifera
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.

Taxonomy

Citation: Didymocyrtis mammifera (Haeckel) Sanfilippo and Riedel 1980
Rank: species
Basionym: Cannartidium mammiferum
Taxonomic discussion: (Haeckel) 1887 p 375 pl 39 fig 6 as Cannartidium mammiferum; Sanfilippo and Riedel, 1980 p 1010

Catalog entries: Cannartidium mammiferum

Original description: Cortical shell thin walled, having a circle of six to eight conical protuberances in the greatest breadth of both chambers, each of which exhibits a central apical pore, surrounded by a circle of six to eight oblique larger pores. Between the protuberances occur nine to ten pores on the half meridian of each chamber, circular, subregular, twice to three times as broad as the bars. Polar tubes cylindrical, conical at the closed end, with smaller pores, about as long as the greatest breadth of the chambers, as broad as the spherical outer medullary shell.

Main axis (without tubes) 0.13, greatest breadth (including the protuberances) 0.1; pores 0.005 to 0.008, bars 0.003; length of the polar tubes 0.09, basal thickness 0.02.
Remarks on original description: Haeckel listed Cannartidium mammiferum under the subgeneric name Cannartidissa, but did not include the subgeneric name in the species name.

Stratigraphic information for LM21 from Riedel, 1959, p.287.

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:

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

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


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Didymocyrtis mammifera compiled by the radiolaria@mikrotax project team viewed: 25-11-2020

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