Cycladophora humerus

Classification: rads_cenozoic -> Theoperidae -> Theopilidae -> Cycladophora -> Cycladophora humerus
Sister taxa: C. antiqua, C. bicornis, C. cabrilloensis, C. campanula, C. conica, C. cosma, C. davisiana, C. golli, C. humerus, C. pliocenica, C. robusta, C. sakaii, C. spongothorax, C. tetracantha, C. sp.


Citation: Cycladophora humerus (Petrushevskaya) Lombari and Lazarus 1988
Rank: species
Basionym: Clathrocyclas humerus
Taxonomic discussion: (Petrushevskaya) 1975 p.586 pl.15 figs. 22&23; pl. 43 figs.1&2; as Clathrocyclas; Lombari and Lazarus 1988 p.123 pl.9 figs.1-6; Clathrocyclas humerus in Petrushevskaya, 1975

Catalog entries: Clathrocyclas humerus

Original description: The number of pores (about 13 in the transverse row), the shell outline with the small velum, and the dimensions are the same as in C. bicornis (Popofsky). The distinguishing characteristics are the pronounced "shoulders" and thickened part of the thorax (Plate 15, Figure 7). Distinguishing characters (rw): It is very similar to the "shoulders" of the Paleocene species (Plate 15, Figures 18-20), but C. humerus has more pores. It is difficult to say if the shoulders may originate in different branches of Clathrocyclas independently (in parallel way), or if the two species, the Paleocene and C humerus are closely related.
Remarks on original description: The description is based on 46 specimens from Site 278 (Cores 12-30).


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:


Lombari, G. & Lazarus, D. (1988). Neogene cycladophorid radiolarians from North Atlantic, Antarctic, and North Pacific deep-sea sediments. Micropaleontology. 34(2): 97-135. gs

Petrushevskaya, M. G. (1975a). Cenozoic radiolarians of the Antarctic, Leg 29, DSDP. Initial Reports of the Deep Sea Drilling Project. 29: 541-675. gs


Cycladophora humerus compiled by the radiolaria@mikrotax project team viewed: 18-4-2021

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