CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina crassa Shutskaya 1970

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 -> G -> Globigerina -> Globigerina crassa
Other pages this level: << < G. columbae, G. compacta, G. compressa, G. compressa caucasica, G. compressaformis, G. concinna, G. concinna altihelix, G. concinna anapetes, G. conglobata, G. conglomerata, G. conglomerata Terquem, G. conglomerata paula, G. conica, G. contorta, G. corpulenta, G. crassa, G. crassaformis, G. cretacea, G. cretacea delrioensis, G. cretacea eggeri, G. cretacea esnehensis, G. cretacea saratogaensis, G. cristata, G. cristatiformis, G. cryophila, G. cyclostoma, G. danica, G. danvillensis, G. daubjergensis, G. decepta, G. depressa, > >>

Globigerina crassa

Citation: Globigerina crassa Shutskaya 1970
Rank: Species
Type locality: Malyy Balkhan Mts., western Turkmenia, USSR
Type age: Upper Paleocene, Kachan Stage, Acarinina tadjikistanensis djanensis Zone
Type sample and level: Lower Danat Subsuite
Holotype Repository: probably deposited in the collec- tions of the All-Union Scientific-Research Geological-Prospecting Petroleum Institute (VNIGNI), Moscow
Type & figured specimens: holotype (fig. 4a-c), no. 1581-1-62
Description on pages: 183

Current identification/main database link: Not linked - add to pf_cenozoic :: pf_mesozoic :: ?


Original Description
Translation from the Russian. - Test medium-sized to large (0.35-0.45 mm.), tlattened dorsally, convex ventrally, subtriangular: a) elongation coefficient 1.1-1.2: b) broadening coefficient 1.3-1.5. Structure of initial part of test globigerinoid, low-trochoid. 7-8 chambers in initial part of test. 3.5 chambers. rapidly and nonuniformly enlarging, in the last whorl. Relationship of dimensions of individual elements of the last whorl: a) ratio of width of largest (penultimate) chamber to the width of the last chamber 1-1.3; b) last chamber either subtriangular or hemispherical, more extended lengthwise than in width, ratio 1.1-1.3. Apertural part of inner margin of last chamber lies obliquely relative to umbilicus. Side surface of last chamber broadly rounded and oval, sometimes extended across the width. Its height is greater than the height of the preceding part of the test. Shape of penultimate chamber subquadrate, of first one rounded; surface of chambers flattened-intlated. Chambers freely arranged. Intercameral sutures broad, not too deep. Umbilical depression broad. Outer margin coarsely scalloped, in the initial part of the last whorl the outer margin is narrow. Aperture marginal, oblique, slitlike, short, above the half-chamber, does not reach the middle of the peripheral margin. Pores comparatively small.

Extra details from original publication
Variation. - Expressed in differing test dimensions: very large tests (up to 0.45 mm.) with a large broadening coefficient (up to 1.5) are commonly found.

Comparison. - The specimen figured by Loeblich and Tappan (1957) as G. triloculinoides in association with foraminifera from the Coal Bluff Formation is referred to the species described. In both the American specimen of this species and the specimens in the material studied, besides the three chambers the half-chamber takes part in building the last whorl; the maximum width of the spire in the last whorl is reached in the area of the next-to-last chamber, the aperture is oblique, slitlike. The same features also characterize the test described by White (1928) as G. bulloides. Globigerina crassa differs from G. gerpegensis by having a broader penultimate chamber and a subtriangular test.

References:

Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 173-198. gs

Shutskaya, E. K. (1970a). Morphologic groups and descriptions of species of Globigerina and Acarinina in the lower Paleogene of the Crimea, the Caucasus Foreland, and western Central Asia. Trudy Instituta Vsesoyuznyy NauchnoIssledovatel'skiy Geologorazvedochnyy Neftyanot Institut. 69: 79-113. gs

White, M. P. (1928). Some Index Foraminifera of the Tampico Embayment Area of Mexico. Journal of Paleontology. 2(3): 177-215. gs


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Globigerina crassa compiled by the pforams@mikrotax project team viewed: 9-4-2020

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