Podocyrtis chalara


Classification: rads_cenozoic -> Pterocorythidae -> Podocyrtis -> Podocyrtis chalara
Sister taxa: P. acalles, P. ampla, P. apeza, P. aphorma, P. argulus, P. chalara, P. coronatus, P. diamesa, P. dorus, P. fasciolata, P. goetheana, P. helenae, P. mitra, P. mitrella, P. papalis, P. phyxis, P. platypus, P. sinuosa, P. trachodes, P. sp.,

Taxonomy

Citation: Podocyrtis chalara Riedel & Sanfilippo 1970
Rank: species
Basionym: Podocyrtis chalara
Taxonomic discussion: Riedel & Sanfilippo 1970 p.535 pl.12 figs.2-3; Riedel & Sanfilippo 1978 p.71 pl.; Sanfilippo et al.1985 p.697 fig. 30.11

Catalog entries: Podocyrtis chalara

Original description: Cephalis [three-lobed],irregularly hemispherical, with few to many small pores, and bearing a stubby bladed horn. Thorax thick-walled with rough surface approximately hemispherical, with rather large subcircular pores. Collar and lumbar strictures distinct. Abdomen robust, with smooth surface, of very large subangular meshes usually in approximate longitudinal rows; in outer form it expands slightly, then contracts distally. Abdominal pores commonly have short thorns projecting inward from their periphery. Vestigial triangular teeth are rarely present.

Thorax 40-65 µ long, 80-95 µ wide. Abdomen 155 (rarely 85) - 255 µ long and 125 (rarely 100) - 165 µ wide. Distinguishing characters (rw): This species is distinguished from P. (L.) mitra by having less than 13 pores around the widest part of the circumference of the abdomen (Riedel and Sanfilippo, 1978a, p.86), and from P. (L.) goetheana as indicated under that species. From P. (L.) trachodes, P. (L.) chalara is distinguished by larger pores and usually smooth outline. (Sanfilippo et al., 1985) Phylogeny (rw): P. (L.) chalara evolved directly from P. (L.) mitra, and gave
rise to P. (L.) goetheana.
Remarks on original description: The small thorax, with rough surface and pores not longitudinally aligned, shows little variation. The abdomen is shorter in early than in late forms, with the exception that in some of these latter it is reduced to two or three rows of large pores and is therefore abnormally short. The large, subangular pores of the abdomen increase in size with time, and towards the end of the range they lose their longitudinal alignment. (Sanfilippo et al., 1985)

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

Plot of occurrence data:

References:

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. (1978a). Stratigraphy and evolution of tropical Cenozoic radiolarians. Micropaleontology. 23(1): 61-96. gs

Sanfilippo, A., Westberg-Smith, M. J. & Riedel, W. R. (1985). Cenozoic Radiolaria. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 631-712. gs


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Podocyrtis chalara compiled by the radiolaria@mikrotax project team viewed: 20-10-2020

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