radiolaria - rads_cat - Anthocyrtoma frizzelli

CATALOG OF ORIGINAL DESCRIPTIONS: Anthocyrtoma frizzelli 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 -> A -> Anthocyrtoma -> Anthocyrtoma frizzelli
Other pages this level: A. alterna, A. ardeola, A. frizzelli

Anthocyrtoma frizzelli

Citation: Anthocyrtoma frizzelli Nishimura 1992
Rank: species
Described on page(s) : p.332
Type specimens: pl.9, figs.13,14; pl.13, fig.8
Type repository: Holotype no n°, and paratypes n° LMMN AN0011-1, and LMMN AN0007-1.Laboratory of the Microfossil's study of Matsumoto, Nagano, Japan.
Family (traditional): not-known
Family (modern): Nassellaria

Current identification:

Original Description

Shell consists of three segments; cephalis spherical or hemispherical, porous, slightly rough, bearing two short, small, conical or long, slender apical horns. Collar stricture with three large pores internally, and moderately defined externally. Cephalic structure has A, V, MB, two L and D; two L and D extend as ribs. Thorax campanulate, smooth-surfaced with regular pores in size and arrangement. Abdomen short, slack like shirrs with rather smaller pores, more irregularly arranged than those of thorax. Rare specimens have weak ridges extending from cephalis through over the thorax.

(Based on 10 specimens) Overall height 170-228 µ, of cephalis and thorax 120-135 µ, maximum width of thorax 100-120 µ and of cephalis 40-52 µ. Distinguishing characters (rw): This species is distinguished from Anthocyrtoma sp. (in Riedel and Sanfilippo 1970, pl. 6, figs. 2-4) by the thorax lacking spines and possessing a small number of rather larger pores. This species differs from Lamptonium fabaeforme fabaeforme (in Foreman 1973, p. 436, pl. 6, figs. 6-9) in possessing two slender apical horns.



for Dr. Don L. Frizzell in honor of his contribution to Paleocene radiolarian study.

Extra details from original publication

Editors' Notes
The species examined here is composed of an inflated thorax which is somewhat constricted toward the mouth, and has two apical horns. The species is assigned to this genus by reason of its possessing only two apical horns and an inflated thorax.


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


Anthocyrtoma frizzelli compiled by the radiolaria@mikrotax project team viewed: 30-9-2022

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