Catalog - Globorotalia hessi Catalog - Globorotalia hessi

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia hessi Bolli & Premoli Silva 1973

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 -> Globorotalia -> Globorotalia hessi
Other pages this level: << < G. faragi, G. flabelliformis, G. fohsi, G. fohsi andina, G. fohsi robusta, G. formosa formosa, G. formosa gracilis, G. gavalae, G. gemma, G. globigeriniformis, G. greenhornensis, G. hadii, G. haunsbergensis, G. haynesi, G. hemisphaerica, G. hessi, G. hexacamerata, G. hirsuta aemiliana, G. hirsuta eastropacia, G. hispidicidaris, G. humerosa, G. hungarica, G. ikebei, G. imitata, G. inconspicua, G. inconspicua aculeata, G. inflata, G. inflata praeinflata, G. inflata triangula, G. insolita, G. involuta> >>

Globorotalia hessi

Citation: Globorotalia hessi Bolli & Premoli Silva 1973
taxonomic rank: species
Type specimens: Holotype (C-27611) and figured paratypes (C-27612-27614)
Type sample (& lithostrat): DSDP Leg 4, Site 19, Core 1, Section 3 (10-12 cm);
Type age (chronostrat): Globorotalia truncatulinoides truncatulinoides Zone, Pleistocene
Type locality: from Leg 4, Site 19, Core 1, Section 3 (10-12 cm) - central Venezuela Basin, Caribbean Sea (14°47.11'N; 69° 19.36'W); .
Type repository: Basel?

Current identification/main database link: Globorotalia hessi Bolli & Premoli Silva, 1973


Original Description

Shape of test very low trochospiral, flat on spiral side except for raised edges of last few chambers. Last chamber often slightly offset obliquely downwards. Umbilical side strongly convex, somewhat inflated between periphery and umbilical margin. Equatorial periphery roughly quadrangular in outline only very slightly lobate. In side view, rounded to subacute, particularly on the last chamber which is often somewhat smaller and thinner walled compared with earlier ones; there may be a faint peripheral keel. Wall calcareous, perforate, thick, often covered with pustules, particularly in central portion of spiral side and towards umbilical margin. Chambers rounded to subangular in side view compressed laterally, four in last whorl, increasing slowly in size. Sutures between last chambers on spiral side fairly straight and almost tangential to inner spiral portion, slightly depressed between last chambers; on umbilical side radial, depressed between last chambers. Umbilicus very narrow, deep. Aperture a narrow slit, interio-marginal, extraumbilical-umbilical, sometimes with a weak lip. Coiling predominantly sinistral in the Caribbean area.

Size:
Largest diameter of holotype: 0.5mm.

Etymology:
The species is named for Harry H. Hess in remembrance of his outstanding contributions to geology.

Extra details from original publication
Stratigraphic range: Pleistocene. Base Globorotalia hessi Sub- =zone (subzone of Globorotalia truncatulinoides truncatulinoides Zone) to within Globigerina calida calida Subzone.

Remarks: A comparison of the holotypes of Globorotalia crassaformis and G. hessi shows that the new species is larger in size (0.5 against 0.4 mm), is more distinctly quadrangular, and is less lobate in equatorial view. While the spiral side of G. crassaformis is described as flat, in G. hessi it is often concave. The chambers of the new species increase in size less rapidly, and the final chamber never reaches such a large relative size as in the G. crassaformis holotype. In peripheral view, the chambers of G. hessi are more inflated. Further, its walls are more robust and are usually covered, at least partially, by pustules. In contrast to G. hessi, sutures on the spiral side of G. crassaformis are distinctly curved, and those on the umbilical side are more incised. G. hessi has a different stratigraphic range; in the Caribbean area it is restricted to part of the Pleistocene whereas Globorotalia crassaformis extends from Early Pliocene to Recent.

References:

Bolli, H. M. & Premoli Silva, I. (1973). Oligocene to Recent planktonic foraminifera and stratigraphy of the Leg 15 sites in the Caribbean Sea. Initial Reports of the Deep Sea Drilling Project. 15: 475-497. gs

Bolli, H. M. (1970). The foraminifera of sites 23-31, leg 4. Initial Reports of the Deep Sea Drilling Project. 4: 577-643. gs

Lamb, J. L. & Beard, J. H. (1972). Late Neogene planktonic foraminifers in the Caribbean, Gulf of Mexico, and Italian stratotypes,. University of Kansas Paleontological Contributions, Articles. 57: 1-67. gs O


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Globorotalia hessi compiled by the pforams@mikrotax project team viewed: 20-4-2024

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