Psychospyris grandis

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


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

Catalog entries: Psychospyris grandis

Original description: Cephalic cavity, together with the "pocket" below the lateral bars, almost circular in outline, covered by very delicate lattice-plates with pores re-sembling an irregular network rather than circular. Chambered zone narrow, dense, peripherally thorny, and similar in structure around the entire periphery. Sagittal ring high and delicate, at its upper end con-nected to the inner margin of the spongy zone by paired sagittal ring bars which are generally shorter than in P. intermedia.

(Based on 6 specimens) Width of cephalic cavity 265 to 365µm; height of sagittal ring 110 to 145µm; greatest diameter of total skeleton 375 to 475µm. Distinguishing characters (rw): This species is distinguished from Psychospyris intermedia by its larger size, subcircular outline and constantly elongated and delicate sagittal ring. Phylogeny (rw): This species evidently represents the termination of its lineage.


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

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