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radiolaria - rads_cat - Calocyclas costata radiolaria - rads_cat - Calocyclas costata

CATALOG OF ORIGINAL DESCRIPTIONS: Calocyclas costata Riedel 1959

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 -> Calocyclas -> Calocyclas costata
Other pages this level: C. aculeata, C. advena, C. amicae, C. aphradia, C. aspasia, C. barbadensis, C. casta, C. coronata, C. coronata globosa, C. costata, C. crassa, C. cylindrica, C. destefanii, C. disparidens, C. extensa, C. extensa contracta, C. hannai, C. hyalogaster, C. litos, C. margatensis, C. minervae, C. monumentum, C. motoyamai, C. nakasekoi, C. ovata> >>

Calocyclas costata

Citation: Calocyclas costata Riedel 1959
Taxonomic rank: species
Described on page(s) : p.296
Type specimens: pl.2, fig.9
Type repository: Holotype USNM No. 563372, U.S. National Museum, Washington, D.C.
Family (traditional): Pterocorythidae
Family (modern): Pterocorythidae

Current identification/main database link: Calocycletta costata (Riedel) Riedel&Sanfilippo 1970


Original Description

Cephalis ovate, lobed, with sparse subcircular to circular pores and bearing a stout, conical apical horn. Thorax subspherical, with pores circular, hexagonally arranged and with a pronounced tendency to longitudinal alignment, the longitudinal rows separated by pronounced costae. No lumbar stricture externally. Abdomen subcylindrical or tapering distally, narrower than the widest part of the thorax. Abdominal pores subcircular or circular, arranged hexagonally with apparent longitudinal alignment (these longitudinal lines are continuous with those of the thorax) and often with longitudinal ridges separating pore rows. Terminal feet eleven to eighteen in number, lamellar, usually truncate, parallel or slightly convergent, broader than the spaces between them, usually situated opposite alternate rows of abdominal pores.

Size:
Based on 30 specimens. Length of apical horn 115-230 µ; of cephalis 30-45 µ; of thorax 70-100 µ; of abdomen 10-33 µ; of feet 12-70 µ. Breadth of cephalis 38-53 µ; of thorax 103-135 µ; of abdomen (distally) 75-108 µ.

Etymology:
Latin "costatus" (-a, -um) = ribbed

Extra details from original publication
Distinguishing characters: This species is distinguished from Calocyclas virginis by the pronouncedly costate thorax and otherwise smooth shell surface.

This species is distinguished from all others of the genus by the longitudinal ribs between the rows of thoracic pores, and the consequently very smooth contour. In addition to this, it differs from co-occurring specimens of C. virginis in that the latter usually have a distinct change in contour where the horn leaves the cephalis, and a more abrupt collar stricture. It differs from C. caepa Moore (1972; a member of the C. robusta group of Riedel and Sanfilippo, 1978a, p.66) in that the latter has a bladed horn, and a more delicate abdomen with smaller, more numerous pores, terminating in short, triangular teeth. There is a superficial resemblance also to Calocyclas turris Ehrenberg (1873), but that is an Eocene species with the simple cephalis characteristic of the theoperids. (Sanfilippo et al., 1985)

Editors' Notes
Although rare specimens appear to be transitional between Calocyclas virginis and Calocyclas costata, it is now considered advisable to recognize the two as distinct species. Transitional forms are to be expected if Calocyclas costata arose from Calocyclas virginis, as appears to have been the case.

References:

Riedel, W. R. (1959a). Oligocene and Lower Miocene Radiolaria in tropical Pacific sediments. Micropaleontology. 5(3): 285-302. gs

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Calocyclas costata compiled by the radiolaria@mikrotax project team viewed: 25-3-2025

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