CATALOG OF ORIGINAL DESCRIPTIONS: Aegospyris incertecoronata Clark & Campbell 1942

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 -> Aegospyris -> Aegospyris incertecoronata
Other pages this level: A. aegoceras, A. aequispina, A. caprina, A. incertecoronata, A. octospina, A. transitionalis

Aegospyris incertecoronata

Citation: Aegospyris incertecoronata Clark & Campbell 1942
Rank: species
Type specimens: pl.9, fig.14
Type repository: University of California, Museum of Paleontology, San Francisco
Described on page(s) : p.58
Family (traditional): Trissocyclidae
Family (modern): Triospyridae

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Current identification:

Original Description
Shell weakly dipleuric, nut-shaped, with five feet; shell divided vertically into two equal lobes by a very shallow sagittal stricture or notch, the lobes separated by a narrow, hyaline band of shell-substance, pores small, numerous, circular, with tubular collars so that the general surface is warty like a Chinese lichee nut, the pores scattered, apparently in loose whorls, and well-spaced; coryphal surface with a short (?) conical, frontal horn on each lobe formed from the great-circle with which it connects, and possibly a third odd unpaired horn of similar shape; feet relatively long, tips sharp, very strongly curved inwardly, clawlike, divergent, circular in cross section; aperture the simple opening of the shell with arched interradii.

Length of leg, 65.0µm; of shell, 60.6µm; breadth, of shell, 69.4µm; diameter of pores, 6.6µm. Distinguishing characters (rw): Aegospyris incertecoronata n. sp. lacks the collar pores of A. aequispina Haeckel (1888), (Recent, Pacific), and A. longibarba Ehrenberg (1875 = Ceratospyris longibarba), (Barbados), is not cuboidal as Octospina Haeckel (1887), (Recent, Atlantic), and the sagittal stricture is not deep as in A. aegoceras Haeckel (1887), (Recent, Pacific), and A. caprina Haeckel (1887), (Recent, Pacific).
It is by no means certain that this species belongs to Aegospyris, since the odd coryphal spine is not all positively present in the present writers' specimens. It may have been snapped off at the base so that no trace was left which can be picked up by the most careful microscopic observation. This seems unlikely. Possibly the specimen is aberrant in this character or it may be a representative of an undescribed genus which is intermediate between Pentaspyris and Taurospyris.


Clark, B. L. & Campbell, A. S. (1942). Eocene radiolarian faunas from the Mt. Diablo area, California. Geological Society of America, Special Papers. 39: 1-112. gs


Aegospyris incertecoronata compiled by the radiolaria@mikrotax project team viewed: 27-2-2021

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