CATALOG OF ORIGINAL DESCRIPTIONS: Rugoglobigerina (Rugoglobigerina) bulbosa 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) bulbosa
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) bulbosa

Citation: Rugoglobigerina (Rugoglobigerina) bulbosa Belford 1960
Rank: Species
Type locality: From the scarp at Pillarawa Hill, in the Murchison River area of Western Australia.
Type age (chronostrat): Santonian
Type sample (& lithostrat): Toolonga Calcilutite and Gingin Chalk
Type specimens: Holotype (C.P.c. 3395), paratypes A to E (C.P.C. 3396 to 3400) and thin sections (C.P.C. 3401 & 3402)
Type repository: Canberra, Australia; Commonwealth Palaeontological Collection

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


Original Description
Diagnosis: Test trochoid, spiral surface flat or only slightly convex, chambers globular, inflated, usually 4 in last whorl. Sutures depressed, surface of test ornamented with small ridges, on some chambers in a meridional pattern. Aperture interio- marginal umbilical, large.

Description: Test trochoid, both dextrally and sinistrally coiled forms known, with the latter the more common; umbilicus small, circular, usually infilled. Chambers globular, inflated, forming to 2-2½ whorls, successive whorls strongly overlapping and spiral surface flat or only slightly convex; usually four but sometimes five chambers on last whorl increasing only slowly in size as added. Very rare specimens have last chamber smaller than penultimate chamber, formed to one side of test and always smooth. Earlier chambers and sutures on spiral side often obscured by surface ornamentation, the later sutures straight or slightly curved, depressed; sutures on umbilical side straight, depressed. Surface of test ornamented with small discontinuous ridges, irregularly arranged on earlier chambers and forming meridional pattern on chambers of last whorl. Vail of test calcareous, finely perforate, radiate in structure. Aperture interiomarginal umbilical, large and arcuate, not always observed; well-preserved specimens have distinct tegilla extending over umbilicus.

Etymology: The specific name is from the Latin bulbosus, swollen.

Extra details from original publication
1917. Guembelina globifera Reuss sp. CHAPMAN, Bull. geol. Surv. W. Aus(., 72, p. 20, pI. 2, fig. 18.

Remarks: Rugoglobigerina (R.) bulbosa is closer to the R. macrocephala group than to any other described Upper Cretaceous Rugoglobigerinas, particularly to R. macrocephala ornata Bronnimann. The chambers of R. (R.) bulbosa do not increase in size as rapidly as in R. macrocephala subspp., the test is more rounded in outline, and it also lacks hispid ornamentation.
R. (R.) bulbosa is known from Santonian beds of the Toolonga Calcilutite in the Murchison River area and from the Gingin Chalk. Fifty-nine sinistrally coiled and 30 dextrally coiled forms 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) bulbosa 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) bulbosa Belford, 1960

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Jeremy Young (Tonbridge, UK)

corrected, thanks Jeremy

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