Psychospyris intermedia

Classification: rads_cenozoic -> Trissocyclidae -> Acanthodesmiidae -> Psychospyris -> Psychospyris intermedia
Sister taxa: P. grandis, P. intermedia, P. parva, P. sp.


Citation: Psychospyris intermedia Riedel & Sanfilippo 1971
Rank: species
Basionym: Psychospyris intermedia

Catalog entries: Psychospyris intermedia

Original description: Cephalic cavity much larger than that of P. parva, in early specimens not bounded by a distinct frontal ring and in late specimens bounded by an apparently secondarily developed line at the inner margin of the chambered zone. Chambered zone in some specimens represented only by a zone of strongly developed thorns. Sagittal ring in early specimens similar to that of R parva, and surmounted by a pair of long sagittal ring bars (in position "q" of Petrushevskaya, 1969), and in later specimens much more delicate and higher. Lattice shell on anterior and posterior faces of cephalic cavity very delicate, with small pores, and often broken.

(Based on 15 specimens) Width of cephalic cavity 195 to 330µm; height of sagittal ring 50 to 115µm; greatest diameter of total skeleton (including spines) 245 to 435µm. Phylogeny (rw): This species is phylogenetically intermediate between Psychospyris parva and P. grandis, and is usually kidney-shaped or elliptical in outline rather than sub circular.


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:



Psychospyris intermedia compiled by the radiolaria@mikrotax project team viewed: 31-10-2020

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