Catalog - Globorotalia inflata triangula Catalog - Globorotalia inflata triangula

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia inflata triangula Theyer 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 inflata triangula
Other pages this level: << < 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, G. irrorata, G. juanai, G. kajmatica, G. kilabiyaensis, G. kingmai, G. kolchidica, G. kotucensis, G. kugleri, G. lacerti, G. laeta, G. lehneri, G. lenguaensis, G. lensiformis> >>

Globorotalia inflata triangula

Citation: Globorotalia inflata triangula Theyer 1973
Taxonomic rank: sub-species
Type age (chronostrat): Pleistocene
Type locality: Holotype (USC No. 1580) and 20 paratypes (USC Nos. 1581-1586) from 955-960 cm within core E39-76, collected at 36"30'S, 161"14'E (Tasman Basin), at a depth of 3785 meters.
Type repository: Los Angeles, Univ Southern California,

Current identification/main database link: Globoconella triangula (Theyer 1973)


Original Description

Description of the holotype: Test of moderate size, about 2 whorls in low, trochospiral arrangement, 3 chambers in last whorl. Dorsal side evolute, subquadrate in outline, flat to barely convex; center of dorsal side covered by translucent, smooth cncrustation completely obscuring earlier whorls. Ventral side involute, subquadrate to subtriangular in outline, strongly convex to subconvex with broadly rounded apex. Chambers rapidly increase in size as added, dorsally reniform at first, subrectangular in the last whorl, two to three times longer than wide; ventrally, subtriangular, slightly inflated, embracing. Sutures dorsally invisible (in clarifying liquids, intercameral sutures are straight to slightly curved and almost tangential to spire) ; ventrally distinct, straight to moderately curved, flush to slightly depressed. Side view subtriangular, broadly rounded peripheric margin. Aperture a narrow, almost straight slit, entirely ventral, without lip. Walls smooth, polished, very finely perforate

Extra details from original publication
Remarks : The new subspecies is easily distinguished from Globorotalia inflata inflata by the highly vaulted to subtriangular ventral side, flat dorsal side, narrow slit-like aperture, and by the three non-globose, subtriangular chambers of the last whorl. There is some variation in the inflation of the chambers, and specimens with three and a half chambers in the last whorl also occur. Rare specimens that are transitional between the new subspecies and the nominate subspecies have also been found. These have three and a half chambers which are more inflated, and their apertures are low arches.

Lamb and Beard‘s (1972) G. inflata variants from the early Pleistocene of the Gulf Coast, which would approximately correlate with late Gauss (J. H. Beard, personal communication), are within the morphologic range of the present subspecies. Specimens received from the above authors are somewhat smaller and thinner-walled than the present forms. If the paleomagnetic age of Lamb and Beard‘s variants is truly Gauss the present subspecies could be Pliocene to Pleistocene in range.

Parker (1967) has illustrated a G. inflata variant from Indian Ocean core DODO117 (164-166 cm) that was sampled at a level correlated with Zone N 21 of Blow (1969). Her specimens are closer to transitional forms between the new subspecies and G. inflata s.s.

There are no variations of G. inflata comparable to the present subspecies in the Holocene (compare Yen, 1971). Its subspecific level is supported by transitional specimens to G. inflata s.s., by the restricted distribution, and by the apparently short stratigraphic range.

References:

Theyer, F. (1973). Globorotalia inflata triangula, a new planktonic foraminiferal subspecies. Journal of Foraminiferal Research. 3: 199-201. gs


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Globorotalia inflata triangula compiled by the pforams@mikrotax project team viewed: 11-8-2026

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