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.
Linked specimens: USNM-249221 USNM-249220 USNM-249219 USNM-249222
Current identification/main database link: Globigerinoides kennetti (Keller & Poore 1980)
Test free. globular to subglobular. average size for the genus with 2 or 3 whorls of 3 to 3½ spherical to subspherical chambers per whorl. Sutures are distinct and incised. Typical specimens are low-spired and have 3 chambers in the ultimate whorl. The umbilica l, small. circular primary aperture of the ultimate chamber is centered over the suture between the penultimate and antepenultimate chambers (pl. 1. figs. 1. 7). The primary aperture of specimens with 3½ chambers in the final whorl, and of some specimens with 3 chambers in the final whorl, is asymmetrically placed over the suture between the penultimate and antepenultimate chambers (pl. 1. fig. 1 0). Moderately high-spired individuals are occasionally encountered (pl. 1. figs. 4-6). Supplementary apertures are commonly, but not always present at suture junctions on the spiral side of the ultimate and less frequently, penultimate chambers of the final whorl. Specimens are usually heavily encrusted. so that it is often difficult to tell whether or not supplementary apertures are present. Encrustation similarly masks details of test surface structure, but spine bases, and thus evidence for a spinose test, are seen on some specimens (pl. 1. fig. 9).
Etymology: named for Dr. James P. Kennett. University of Rhode Island.
Extra details from original publication
Globigerinoides cf. G. ruber (d'Orbigny).-POORE. 1979. p. 470. pl. 11. figs. 1-6.
Comments: Globigerinoides kennetti differs from Globigerinoides bollii Blow in typically possessing 3 to 3½ instead of 4 chambers in the last whorl, less embracing chambers, and a more subquadrate outline. Globigerinoides kennetti is distinguished from Globigerinoides ruber (d 'Orbigny) by a more heavily encrusted test. more embracing chambers. and variable supplementary apertures which, if present, are very small compared to the large supplementary apertures commonly found in G. ruber. A heavily encrusted test and a constricted primary aperture distinguish G. kennetti from Globigerinoides subquadratus Bronnimann. In addition. these 2 species do not have overlapping ranges.
Globigerinoides kennetti appears to have evolved from the Globigerina woodi group. and specimens judged intermediate between G. woodi Jenkins and Globigerinoides kennetti are occasionally encountered (pl. 1. figs. 11-1 2) . Typical G. kennetti is easily distinguished from Globigerina woodi by having 3 chambers in the last whorl, a subquadrate outline, commonly developed supplementary apertures. and usually a more prominently encrusted test.
Keller, B. M. & Poore, R. Z. (1980). Globigerinoides kennetti, a new Late Miocene to earliest Pliocene planktonic foraminifer from the Atlantic and Pacific oceans. Micropaleontology. 26(2): 189-192. gs Poore, R. Z. (1979). Oligocene through quarternary planktonic foraminiferal biostratigraphy of the North Atlantic: DSDP LEG 49. Initial Reports of the Deep Sea Drilling Project. 49: 447-517. gs
Keller, B. M. & Poore, R. Z. (1980). Globigerinoides kennetti, a new Late Miocene to earliest Pliocene planktonic foraminifer from the Atlantic and Pacific oceans. Micropaleontology. 26(2): 189-192. gs
Poore, R. Z. (1979). Oligocene through quarternary planktonic foraminiferal biostratigraphy of the North Atlantic: DSDP LEG 49. Initial Reports of the Deep Sea Drilling Project. 49: 447-517. gs
Globigerinoides kennetti compiled by the pforams@mikrotax project team viewed: 21-4-2021
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