CATALOG OF ORIGINAL DESCRIPTIONS: Globanomalina wilcoxensis globulosa Gohrbandt 1967

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 -> Globanomalina -> Globanomalina wilcoxensis globulosa
Other pages this level: G. laccadivensis, G. ovalis, G. ovalis lakiensis, G. praepumilio, G. rakhiensis, G. simplex, G. simplex orbicularis, G. wilcoxensis globulosa,

Globanomalina wilcoxensis globulosa

Citation: Globanomalina wilcoxensis globulosa Gohrbandt 1967
Rank: sub-species
Type locality: Mattsee, Austria
Type age: Eocene
Type sample and level: Sample 64/1, 36/9 (Go.).
Holotype Repository: Vienna; Department of Geology, Naturhistorisches Museum, Vienna, Austria
Type & figured specimens: Holotype (plate 1, figures 16-17), acquisition no. 683/9 I 1966.

Current identification/main database link:


Original Description
Test free, planispirally coiled, biumbilicate, slightly evolute; periphery moderately lobulate. Wall calcareous, finely perforate, surface smooth. Chambers spherical, the last whorl consisting of 6 chambers, increasing rapidly in size. Sutures radial, slightly curved, depressed. Aperture a low equatorial arch, with a small apertural lip.

Size: Dimensions of holotype: Largest diameter 0.39 mm.

Extra details from original publication
Remarks: Globanomalina wilcoxensis globulosa is well represented in a number of samples from the Helvetikum north of Salzburg. The specimens are closely related to Globanomalina wilcoxensis (Cushman and Ponton), and are regarded as belonging to a subspecies of that form. In common with typical Globanomalina wilcoxensis are the spherical chambers and their rapid increase in size. There seems to be no difference in general size of the new subspecies. Cushman and Ponton ( 1932) reported a diameter of 0.25 mm. for the holotype, but Berggren (1960, p. 91) found the synonymous Globanomalina eocenica (Berggren) to have a size similar to that of Globanomalina wilcoxensis globulosa. However, both of these forms have straight sutures, whereas the new subspecies has slightly but consistently curved sutures. They are never as curved as those of the smaller and somewhat compressed Globanomalina micra (Cole). Globanomalina pseudovoluta (Bandy) has a reticulate wall structure.

Stratigraphic range: Globanomalina wilcoxensis globulosa was not observed in material older than basal Middle Eocene. The associated planktonic foraminiferal fauna at the type locality is listed below, under Globigerina hagni. It suggests correlation with the Hantkenina aragonensis Zone as established by Bolli (I 95 7 b) from Trinidad where this zone is interpreted as the basal part of the Middle Eocene. The present subspecies was not observed in that part of our material which corresponds to the upper part of Bolli's (1957b) Globigerapsis kugleri Zone

References:

Gohrbandt, K. H. A. (1967). Some new planktonic foraminiferal species from the Austrian Eocene. Micropaleontology. 13(3): 319-326. gs


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Globanomalina wilcoxensis globulosa compiled by the pforams@mikrotax project team viewed: 23-1-2020

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