radiolaria - rads_cat - Pterocyrtidium borisenkoi radiolaria - rads_cat - Pterocyrtidium borisenkoi

CATALOG OF ORIGINAL DESCRIPTIONS: Pterocyrtidium borisenkoi Nishimura 1992

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: rads_cat -> P -> Pterocyrtidium -> Pterocyrtidium borisenkoi
Other pages this level: P. borisenkoi, P. genriettae, P. praebarbadense, P. zitteli

Pterocyrtidium borisenkoi

Citation: Pterocyrtidium borisenkoi Nishimura 1992
Taxonomic rank: species
Described on page(s) : p.352
Type specimens: pl.8, figs.9, 10; pl.13, fig.17
Type repository: Holotype no n° and paratype n° LMMN AN0003-3. Laboratory of the Microfossil's study of Matsumoto, Nagano, Japan
Family (traditional): Theoperidae
Family (modern): Lophocyrtiidae

Current identification/main database link: Pterocyrtidium borisenkoi Nishimura 1992


Original Description

Shell of three or more segments. Cephalis subspherical or hemispherical, bearing a stout bladed apical horn sometimes very long, the surface penetrated by small, circular pores. Collar stricture with four collar pores internally, well defined externally. Cephalic structure has A, V, MB, two L and D; V connected to septal ring, two l form parts of septal ring. Thorax irregularly lozenge-shaped, the pores on the surface regular in size and arrangement. Three lateral wings, latticed except for the distal end extend horizontally from the widest part of the thorax. The shell below the wings narrows suddenly.

Size:
(Based on 10 specimens) Overall height 104 µ, height of cephalis and thorax 60-82 µ, maximum width of cephalis 30-32 µ, of thorax 98-125 µ and length of lateral wings 25-62 µ.

Etymology:
for Dr. N. N. Borisenko, in honor of his contribution to Paleocene radiolarian study.

Extra details from original publication
Distinguishing characters: This form is distinguished from Pterocyrtidium genriettae by consisting of diamond-shaped thorax, and by possessing latticed wings extending horizontally. This species may be closely related to the genus Lithochytris.

Editors' Notes
The following species seems to be similar to the type species.

References:

Nishimura, A. (1992). Paleocene radiolarian biostratigraphy in the northeast Atlantic at Site 384, Leg 43, of the Deep Sea Drilling Project. Micropaleontology. 38(4): 317-362. gs


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Pterocyrtidium borisenkoi compiled by the radiolaria@mikrotax project team viewed: 12-2-2026

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=252244 Go to Archive.is to create a permanent copy of this page - citation notes



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