radiolaria - rads_cenozoic - Calocycletta costata radiolaria - rads_cenozoic - Calocycletta costata

Calocycletta costata

Classification: rads_cenozoic -> Pterocorythidae -> Calocycletta -> Calocycletta costata
Sister taxa: C. acanthocephala, C. anekathen, C. caepa, C. cladara, C. costata, C. parva, C. robusta, C. serrata, C. virginis, C. sp.


Citation: Calocycletta costata (Riedel) Riedel and Sanfilippo 1970
taxonomic rank: species
Basionym: Calocyclas costata
1959 Calocyclas costata - Riedel p 296, Plate 2, figure 9
1970 Calocycletta costata - Riedel and Sanfilippo Plate 14, figure 12

Catalog entries: Calocyclas costata

Original description: Cephalis ovate, lobed, with sparse subcircular to circular pores and bearing a stout, conical apical horn. Thorax subspherical, with pores circular, hexagonally arranged and with a pronounced tendency to longitudinal alignment, the longitudinal rows separated by pronounced costae. No lumbar stricture externally. Abdomen subcylindrical or tapering distally, narrower than the widest part of the thorax. Abdominal pores subcircular or circular, arranged hexagonally with apparent longitudinal alignment (these longitudinal lines are continuous with those of the thorax) and often with longitudinal ridges separating pore rows. Terminal feet eleven to eighteen in number, lamellar, usually truncate, parallel or slightly convergent, broader than the spaces between them, usually situated opposite alternate rows of abdominal pores.
Remarks on original description: Although rare specimens appear to be transitional between Calocyclas virginis and Calocyclas costata, it is now considered advisable to recognize the two as distinct species. Transitional forms are to be expected if Calocyclas costata arose from Calocyclas virginis, as appears to have been the case.


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:


Riedel, W. R. & Sanfilippo, A. (1970). Radiolaria, Leg. 4 DSDP. Initial Reports of the Deep Sea Drilling Project. 4: 503-575. gs

Riedel, W. R. & Sanfilippo, A. (1978). Stratigraphy and evolution of tropical Cenozoic radiolarians. Micropaleontology. 24(1): 61-96. gs

Riedel, W. R. (1959a). Oligocene and Lower Miocene Radiolaria in tropical Pacific sediments. Micropaleontology. 5(3): 285-302. gs


Calocycletta costata compiled by the radiolaria@mikrotax project team viewed: 27-2-2024

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