CATALOG OF ORIGINAL DESCRIPTIONS: Tripospyris dubia 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 -> T -> Tripospyris -> Tripospyris dubia
Other pages this level: T. angulata, T. bicornis, T. biloculata, T. byzantina, T. capellinii, T. capitata, T. conifera, T. cortina, T. cortiniscus, T. crassipes, T. diadema, T. diomma, T. dubia, T. eucolpos, T. furcata, T. galea, T. hexomma, T. karakumensis, T. mutinensis, T. sacramentoensis, T. semantidium, T. semantis, T. semantrum, T. tessaromma, T. triplecta, T. brevipes

Tripospyris dubia

Citation: Tripospyris dubia Clark & Campbell 1942
Rank: species
Type specimens: pl.9, fig.12
Type repository: University of California, Museum of Paleontology, San Francisco
Described on page(s) : p.54
Family (traditional): Trissocyclidae
Family (modern): Triospyridae

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Current identification:

Original Description
Shell smooth, nut-shaped, with three feet and apical horn; shell subdivided into two equal lobes by a median vertical constriction, which, however, is only prominently grooved on the coryphal face where it is broadly V-shaped; the pores circular, uniform in diameter, well-packed, approximately sixteen or more on one face of one lobe, both lobes alike in this respect and on both faces, in four indefinite horizontal tiers, four or more to a row, the shell smooth, rather dense, grayish, thick-walled, with a single small, conical, basally prismatic, distally broken, apical horn which lies asymmetrically on the right side of the coryphal groove (left in the photograph) and which arises from the great-circle; on the left side (right in the photograph) is a minute spinule evidently the compliment of the horn; great-circle thick, prismatic, internal; feet three, one caudal and two paired pectoral ones, of equal length, divergent, curved, clawlike, conical, cylindrical, with a narrow, distally decurrent ridge which arises from the base of the foot and continues about halfway down the length of the foot, the tips minutely truncate; interradii low-arched, entire, cortinar plate obscured.

Length of shell, 49.6µm; of feet, 34.2µm (disregarding the curve); breadth of shell, 71.6µm; diameter of pores, 4.4µm. Distinguishing characters (rw): In the absence of definite information regarding the subgeneric status of the species (see Haeckel, p 1025) it is somewhat difficult to compare this Eocene species with those already described. The feet and horn are not, however, so long as those of T. tribrachiata (Ehrenberg) (1875) = Tripospyris tribrachiata, (Barbados), the shell is not rough and lacks distal knobs on the feet as in T. clavata Bütschli = Ceratospyris clavata (1882), (Barbados), nor is it tuberculate as in T. triomma (Ehrenberg 1875) = Ceratospyris triomma, (Barbados). It resembles none of the figured species given in the Challenger Report. It is also aberrant, possibly, for the genus, insofar as it has an asymmetrical horn and is provided with an accessory spinule. If these coryphal projections are disregarded as significant structures of generic value, the species then falls into Tristylospyris (Tristylopyrula). It may be transitional between these genera.

Editors' Notes
[The authors here questionably list this species under the subgeneric name Tripospyrantha and include the subgeneric name in the species name.


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


Tripospyris dubia compiled by the radiolaria@mikrotax project team viewed: 14-4-2021

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