Podocyrtis trachodes


Classification: rads_cenozoic -> Pterocorythidae -> Podocyrtis -> Podocyrtis trachodes
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 trachodes Riedel & Sanfilippo 1970
Rank: species
Basionym: Podocyrtis trachodes
Taxonomic discussion: Riedel & Sanfilippo 1970 p.535 pl.11 fig.7; pl.12 fig.1; Sanfilippo et al.1985 p.699 figs.30.14; No: Podocyrtis (Lampterium) trachodes Riedel & Sanfilippo

Catalog entries: Podocyrtis trachodes

Original description: Cephalis [three-lobed], hemispherical, with many small pores, bearing a three-bladed horn of about the same length. Thorax campanulate and abdomen moderately inflated, broadest at about its middle; both segments thick-walled with rough surface and with subcircular pores, larger in abdomen than in thorax, in indistinct longitudinal rows. Collar and lumbar strictures moderately distinct. Three feet short and flat, spathulate or triangular. In occasional specimens, feet are absent.

Thorax 45-70 ? long; 85-100 µ wide; abdomen 135-230 µ long (including feet) 135-185 µ wide. Distinguishing characters (rw): The general form usually resembles that of P. (L.) mitra, from which P. (L.) trachodes is distinguished by the rough surface [and knobby outline] of the abdomen. Specimens with a short abdomen and poorly developed feet differ from P. (L.) fasciolata by having neither the thickened peristome nor longitudinally aligned thoracic pores. (Sanfilippo et al., 1985) Phylogeny (rw): This species is evidently an offshoot from the main Podocyrtis (Lampterium) lineage, at about the level of transition from P. (L.) sinuosa to P. (L.) mitra. It left no known descendants.
Remarks on original description: The surface of the abdomen is always rough, but the thorax is smooth in early specimens and rough in late ones. When the abdomen is short it is widest medially, and when long it tends to be widest distally. Spathulate feet are normally well developed, rarely vestigial. (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

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 trachodes compiled by the radiolaria@mikrotax project team viewed: 28-10-2020

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