CATALOG OF ORIGINAL DESCRIPTIONS: Trimanicula centrospina Dumitrica 1991

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 -> T -> Trimanicula -> Trimanicula centrospina
Other pages this level: T. centrospina, T. penultima

Trimanicula centrospina

Citation: Trimanicula centrospina Dumitrica 1991
Rank: species
Type specimens: pl.7, figs.8-10
Type repository: Holotype: P. 105564, Collection of the Institute of Geology and Geophysics, Bucharest, Romania.
Described on page(s) : p.52
Family (traditional): Spongodiscidae
Family (modern): Patulibracchiidae

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Current identification:


Original Description
Rays at 120°, usually more or less expanded towards the distal ends which may be wide open or constricted, tending to close. The three spines RL robust, gently pointed, circular in cross section. Their external portion commonly as long as the internal one. The latter portion bears up to 8 pairs of branches on the apical spine, which is straight, and up to 7 pairs of branches on the lateral spines RLb, which are slightly curved in antapical direction in the proximal portion. Cupola of the antapical cap of the girdle S1b tangent to the cortical wall or even external. The same are the two cupolas of the two complete caps of the girdle S2b in the portion between the apical and lateral rays. Cortical wall with dense, circular to subcircular pores of irregular arrangement. Surface smooth or slightly undulate, armed with a small number of spines, especially on the distal end of rays.

(based on 5 specimens): Diameter of microsphere 20µm, maximum size of S1b 32-35µm, of S2b (distance between the two complete cupolas lying in the principal plane) 75-87µm, maximum breadth of arms in the distal portion 80-100µm, length of arms 65-95µm, total length of spines (measured from the microsphere) 185-222µm (RLa) and (RLb).

Editors' Notes
This species derived quite probably from Trimanicula penultima from which it differs primarily by having a more advanced migration of the microsphere. The very few specimens investigated seem to prove that the migration trend that gave rise to T. centrospina has ceased to act in the Oligocene-Pliocene interval in which the species was recorded. This situation is somehow similar to that of Suttonium anomalum (Sutton) (Dumitrica, 1983b). Trigonactinium sp. illustrated by Petrushevskaya and Kozlova (1972) seems to be conspecific with T. centrospina judging from its general outline and length and sturdiness of the three spines RL. Unfortunately the relationship between the inner girdles and the cortical shell is not visible in their figure.

References:

Dumitrica, P. (1991a). Cenozoic Pyloniacea (Radiolaria) with a five-gated microsphere. Revue de Micropaléontologie. 34(1): 35-56. gs


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Trimanicula centrospina compiled by the radiolaria@mikrotax project team viewed: 15-4-2021

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