Tholospyris infericosta

Taxonomy

Catalog entries: Tholospyris infericosta

Original description: Diagnosis: A species of Tholospyris characterized by a lattice shell that surrounds the apex of the sagittal ring and extends below the back of the tribladed basal ring.

Description: Sagittal ring subpolygonal; 51 to 74 μ. high; 37 to 55 μ thick; joined directly to front and back of lattice shell. Frontal spine short; vertical spine very short, projecting from lower third of sagittal ring; no apical or axial spines. A single connector bar projects vertically from front-apex of sagittal ring; primary lateral bars joined to basal ring; no other connector bars. Basal ring oval, indented laterally and sagittally; 55 to 75 μ wide; 37 to 50 μ thick; joined directly to front and back of sagittal ring; encloses four basal pores; narrow horizontal rib extends around circumference. Two to six sulcate lattice bars project downward from back of basal ring and connect distally to horizontal lattice bar or ribbon of lattice shell that is joined to lateral portions of basal ring. Short sulcate lattice spines project downward from this horizontal process; in some specimens two to four sulcate, laterally projecting basal spines are joined to lateral extremes of basal ring. Lattice shell 138 to 184 μ high; 92 to 134 μ wide: slightly constricted sagittally; surrounds apex of sagittal ring; has appearance of thin sheet perforated by circular widely spaced lattice pores 2 to 32μ in diameter. In some specimens lattice bars have narrow median rib on outer surface. Four lattice bars joined to sagittal ring; one junction at proximal end of apical connector bar; one junction between apical connector bar and frontal spine; two junctions between apical connector bar and vertical spine, fhree to seven short, sulcate lattice spines project from apical portion of lattice shell. No vertical, sternal, or frontal pores.

Description

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:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Tholospyris

Tholospyris infericosta compiled by the radiolaria@mikrotax project team viewed: 7-11-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=205872 Go to Archive.is to create a permanent copy of this page - citation notes

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