Catalog - Globigerina labiacrassata Catalog - Globigerina labiacrassata

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina labiacrassata Jenkins 1966

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 labiacrassata
Other pages this level: << < G. infracretacea gargasiana, G. infracretacea trochoidea, G. intermedia, G. isahayensis, G. jurassica, G. juvenilis, G. kelleri, G. khadumica, G. kochi, G. kondoi, G. konkensis, G. kozlowskii, G. krosniensis, G. kugleri, G. kyushuensis, G. labiacrassata, G. lamellosa, G. linaperta, G. linaperta transdanubica, G. linaperta turgida, G. loetterli, G. lozanoi, G. macrastoma, G. marialuisae, G. mckannai, G. medizzai, G. megastoma, G. megastoma cariacoensis, G. mexicana, G. microfoliata, G. micropora> >>

Globigerina labiacrassata

Citation: Globigerina labiacrassata Jenkins 1966
taxonomic rank: Species
Type specimens: TF 1499: holotype & 3 paratypes
Type age (chronostrat): Whaingaroan Stage (Oligocene)
Type locality: F 11447, SI27/425, Sheet S127, grid. ref.: 242932, The Earthquakes, Waitaki Valley, lower intensively bored greensand, mapped by Gage (1957, p. 80) as Kokoamu greensand. Collected by A. 1. Amies.
Type repository: Lower Hutt, New Zealand; New Zealand Geological Survey

Current identification/main database link: Globoturborotalita labiacrassata (Jenkins, 1966)


Original Description

Test free, dextrally coiled, low trochospiral; equatorial periphery quadrilobate, axial periphery rounded.
Wall calcareous, fairly coarsely perforate. Chambers spherical in outline, 13 in about 2½ whorls,  5 in the first whorl, 4 in the second and last; proloculus diameter about 0.03 mm.  Sutures on both the spiral and umbilical sides radial to slightly curved, depressed. Umbilicus large, open. Aperture a high arch,with a very thick rim, interiomarginal, umbilical.

Size:
Maximum diameter 0·50mm.

Etymology:
The specific name labiacrassata is taken from the Latin words labia meaning "lips"" and crassata meaning ""thick"" and refers to the thick apertural rim.

Extra details from original publication
REMARKS: Hornibrook (1961) illustrated two specimens of Globigerina labiacrassata n. sp. under the name Globigerina reticulata Stache but he has since ascertained that none of the original specimens of that species remain in the collections of the Novara Expedition and considers that G. reticulata is a nomen dubium (Hornibrook, 1965).
In the type population there is a wide range in the G. labiacrassata test morphology. The test wall ornamentation  varies from coarse-walled to more finely pitted and from thin to thick walled; the latter specimens having low arched apertures and superficially resembling Globigerina woodi connecta Jenkins, which occurs in the upper Waitakian-Pareora rocks: (No. 71). The final test chamber varies from being larger than the penultimate as in the holotype, to being a smaller bulla-like chamber positioned over the umbilicus (No. 70). There is also a variation in the thickness of the apertural rim, but most specimens have it as well developed as the holotype (Nos. 64-66) with rare specimens  having it much thicker as in the paratype (Nos. 67-69).
Coiling of the tests is random in the type sample, with 64 dextral and 60 sinistral specimens.
G. labiacrassata shows a reduction in the thickness of the apertural rim towards the upper part of its stratigraphic range and it seems to merge into the Globigerina bulloides d'Orbigny population.


Editors' Notes
The article was published in the December 1965 issue of the journal but appeared in early 1966, so for taxonomy the correct date is 1966

References:

Jenkins, D. G. (1966b). Planktonic foraminiferal zones and new taxa from the Danian to lower Miocene of New Zealand. New Zealand Journal of Geology and Geophysics. 8 [1965](6): 1088-1126. gs

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018d). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 8): 231-268. gs

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Globigerina labiacrassata compiled by the pforams@mikrotax project team viewed: 8-9-2024

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