Podocyrtis acalles


Classification: rads_cenozoic -> Pterocorythidae -> Podocyrtis -> Podocyrtis acalles
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 acalles Sanfilippo & Riedel 1992
Rank: species
Basionym: Podocyrtis acalles
Taxonomic discussion: Sanfilippo & Riedel 1992 p 12-14 pl 3 figs 2-5; Hull, 1993 (ODP 136 SR), p 13 pl 8 fig 1 (synonymy); No: Podocyrtis (Lampterium) acalles

Catalog entries: Podocyrtis acalles

Original description: Three-segmented pterocorythid with a broad-based vaguely lobed cephalis, bearing a short bladed horn. The lateral lobes of the cephalis have small irregular pores. Thorax campanulate, with pores in rows separated by longitudinal ridges. Lumbar stricture marked on the external contour by a slight indentation. Abdomen approximately the same length as the thorax, cylindrical to slightly inflated, terminating in a broad hyaline peristome bearing three wide shovel-shaped feet. The abdominal pores are slightly larger than the thoracic ones, in later forms arranged in rows separated by longitudinal ridges. Earlier forms tend to have abdominal pores that are irregular in size and arrangement but with some development of discontinuous ridges.

Based on 40 specimens. Length (excluding horn), 170-240 µ; length of cephalothorax, 90-115 µ; width of thorax 85-115 µ; width of abdomen 90-130 µ. Distinguishing characters (rw): This species is transitional between Podocyrtis (P.) papalis and P. (Lampterium) sinuosa. It is distinguished from P. papalis by the presence of a slight external lumbar stricture, and from P. sinuosa by the proportion of thoracic length to abdominal length (1:1 in the former, and 1:1.5 to 1:3 in the latter). Phylogeny (rw): The evolutionary transition of P. acalles to P. sinuosa occurs in the Theocotyle cryptocephala Zone.

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:

Hull, D. M. (1993). Quaternary, Eocene, and Cretaceous Radiolarians from the Hawaiian Arch, Northern Equatorial Pacific Ocean. Proceedings of the Ocean Drilling Program, Scientific Results. 136: 3-25. gs

Sanfilippo, A. & Riedel, W. R. (1992). The origin and evolution of Pterocorythidae (Radiolaria): A Cenozoic phylogenetic study. Micropaleontology. 38(1): 1-36. gs


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Podocyrtis acalles compiled by the radiolaria@mikrotax project team viewed: 29-11-2020

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