radiolaria - rads_cat - Phormocyrtis striata praexquisita radiolaria - rads_cat - Phormocyrtis striata praexquisita

CATALOG OF ORIGINAL DESCRIPTIONS: Phormocyrtis striata praexquisita 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 -> Phormocyrtis -> Phormocyrtis striata praexquisita
Other pages this level: P. alexandrae, P. annosa, P. bucharica, P. carinata, P. costata, P. ligulata, P. longicornis, P. proxima, P. quadrata, P. striata, P. striata praexquisita, P. vasculum

Phormocyrtis striata praexquisita

Citation: Phormocyrtis striata praexquisita Nishimura 1992
taxonomic rank: sub-species
Described on page(s) : p.346
Type specimens: pl.9, figs.1-3
Type repository: Holotype n° LMMN AN0021-4, and paratype n° LMMN AN0027-6. Laboratory of the Microfossil's study of Matsumoto, Nagano, Japan
Family (traditional): Theoperidae
Family (modern): Pterocorythidae

Current identification/main database link: Phormocyrtis striata praexquisita Nishimura 1992

Original Description

Cephalis subspherical, quite small, with very small pores all over, bearing a stout conical rod-like apical horn, three-bladed in the proximal part. Collar stricture with four collar pores internally, not defined externally. Cephalic structure has A, V, two L and D; V extends obliquely upward at quite a low angle, two l are incorporated into the stout septal ring. Two L and D are not connected to lateral ribs. Thorax subhemispherical, quite thick-walled, with subcircular pores with well-developed pore frames, slightly rough surface with nodal points. Abdomen inflated pyramidal, thick-walled, with subcircular, large pores, developing three convexly curved keels from the uppermost or median part of the abdomen, constricted aperture, termination ragged.

(Based on 10 specimens) Overall height 120-160 µ, height of cephalis and thorax 40-54 µ, maximum width of cephalis 24-32 µ, width of thorax 42-60 µ.

Extra details from original publication
Distinguishing characters: This species seems to be closely related to Phormocyrtis striata exquisita. It is distinguished from the latter by the generally irregular structure of abdomen with outwardly curved keels and not regularly arranged longitudinal rows of pores.

Editors' Notes
Equivalent to Phormocyrtis striata exquisita (Kozlova) Westberg et al., 1980, pl.1, fig.13.


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


Phormocyrtis striata praexquisita compiled by the radiolaria@mikrotax project team viewed: 18-4-2024

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