CATALOG OF ORIGINAL DESCRIPTIONS: Cyclampterium leptetrum Sanfilippo & Riedel 1970

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 -> C -> Cyclampterium -> Cyclampterium leptetrum
Other pages this level: C. brachythorax, C. leptetrum, C. longiventer, C. milowi, C. neatum, C. pegetrum, C. tanythorax

Cyclampterium leptetrum

Citation: Cyclampterium leptetrum Sanfilippo & Riedel 1970
Rank: species
Type specimens: pl.2, figs.11, 12
Type repository: Holotype, AMPH 6P, 52-54 cm.; USNM 167336, K30/0
Described on page(s) : p.456
Family (traditional): Theoperidae
Family (modern): Lophocyrtiidae

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Current identification:

Original Description
Shell generally robust, campanulate to subspherical. Cephalis subspherical, usually poreless but occasionally with a few small pores; thick-walled, especially at the apex. Collar stricture pronounced. Thorax hemispherical or slightly inflated, thick-walled. with subregular circular pores, and a surface which is nodose or, less commonly, only slightly rough or thorny. Abdomen commonly inverted cap-shaped, closed distally, but in some specimens open subcylindrical. Abdominal pores irregular in size and arrangement, generally as large to twice as large as the thoracic pores, generally smaller and more regular than the abdominal pores of C. ? pegetrum. Three to five irregular, subcylindrical, terminal or subterminal feet are present in rare specimens.

(Based on 30 specimens) Total length 225-440µm. Length of thorax 1 50-1 65µm, (rarely to 180µm). its maximum breadth 195-250µm. Distinguishing characters (rw): This species is distinguished from C. ? pegetrum by the larger dimensions of the thorax, and the generally smaller, less irregular pores of the abdomen. It is distinguished from C. ? tanythorax by the less inflated form and commonly nodose surface of the thorax. and by the more irregular abdominal pores.

Etymology: From the Greek leptos = thin, and etron = abdomen.


Sanfilippo, A. & Riedel, W. R. (1970). Post-Eocene "closed" theoperid radiolarians. Micropaleontology. 16(4): 446-462. gs


Cyclampterium leptetrum compiled by the radiolaria@mikrotax project team viewed: 24-2-2021

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