CATALOG OF ORIGINAL DESCRIPTIONS: Rugoglobigerina (Rugoglobigerina) pilula Belford 1960

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: pf_cat -> R -> Rugoglobigerina (Rugoglobigerina) -> Rugoglobigerina (Rugoglobigerina) pilula
Other pages this level: R. (Rugoglobigerina) arwae, R. (Rugoglobigerina) badryi, R. (Rugoglobigerina) bronnimanni, R. (Rugoglobigerina) browni, R. (Rugoglobigerina) bulbosa, R. (Rugoglobigerina) pilula, R. (Rugoglobigerina) plana

Rugoglobigerina (Rugoglobigerina) pilula

Citation: Rugoglobigerina (Rugoglobigerina) pilula Belford 1960
Rank: Species
Type locality: scarp at Pillarawa Hill, in the Murchison River area of Western Australia.
Type age (chronostrat): Santonian - basal Campanian
Type sample (& lithostrat): 14' above the base of the Toolonga Calcilutite and Gingin Chalk
Type specimens: Holotype (C.P.C. 3389), paratypes A to C (C.P.C. 3390 to 3392), and thin sections (C.P.C. 3393 and 3394)
Type repository: Canberra, Australia; Commonwealth Palaeontological Collection

Current identification/main database link: Costellagerina pilula (Belford, 1960)


Original Description

Diagnosis: Test trochoid, chambers globular, inflated, arranged in a high spire, 5-6 in last whorl. Sutures depressed, surface of test ornamented with small ridges, on some chambers in a meridional pattern. Aperture interiomarginal umbilical, large.

Description: Test trochoid, both dextrally and sinistrally coiledforms known, with the latter the more common; umbilicus small, circular, usually infilled. Test trochoid, both dextrally and sinistrally coiled forms occurring, with the latter the more common; umbilicus small, circular, usually infilled. chambers globular, strongly inflated, forming two and one-half to three whorls, each whorl only partly overlapping the one preceding, forming a high sire; five or six chambers in last whorl, increasing slowly in size as added. Sutures straight or slightly curved on spiral side, straight on umbilical side, depressed on both sides. Test ornamented with small discontinuous ridges, irregularly arranged on early chambers and forming a meridional pattern on chambers of last whorl, the last one or two chambers may be smooth. Wall of test calcareous, finely perforate, radiate in structure. Aperture interiomarginal umbilical, large and arcuate, not often observed because of infilling umbilicus; only remnants of tegilla have been observed.


Size: Holtype 0.33 x 0.21 mm. Paratypes 0.33-0.36mm wide x 0.23mm high.

Etymology: The specific name is the diminutive of the Latin pila, ball.

Extra details from original publication

1917. Globigerina bulloides d'Orbigny. CHAPMAN, Bull. Surv. W. Aust., 72. p. 43, pI. 12, fig. 123.
1917. Globigerina cretacea d'Orbigny. CHAPMAN, Ibid., p. 43, pI. 11, fig. 102.

Remarks: R. pilula is distinct from any other described species of Rugoglobigerina. It is known from the Santonian and basal Campanian beds of the Toolonga Calcilutite in the Murchison River area, and also from the Gingin Chalk. Thirty-eight sinistrally coiled and twenty dextrally coiled specimens have been found.

References:

Belford, D. J. (1960). Upper Cretaceous foraminifera from the Toolonga Calcilutite and Gingin Chalk, Western Australia. Australia Bureau of Mineral Resources, Geology and Geophysics Bulletin. 57: 1-198. gs


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Rugoglobigerina (Rugoglobigerina) pilula compiled by the pforams@mikrotax project team viewed: 29-11-2020

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Comments (1)

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Fran├žois

Published: Rugoglobigerina (Rugoglobigerina) pilula Belford, 1960

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Jeremy Young (Tonbridge, UK)

corrected, thanks Jeremy

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