Catalog - Globorotalia miotumida explicationis Catalog - Globorotalia miotumida explicationis

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia miotumida explicationis Jenkins 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 -> Globorotalia -> Globorotalia miotumida explicationis
Other pages this level: << < G. mayeri, G. mayeri nympha, G. menardii antarctica, G. menardii fijiensis, G. menardii gibberula, G. menardii jamesbayensis, G. menardii miocenica, G. menardii miotumida, G. menardii multicamerata, G. menardii neoflexuosa, G. menardii panda, G. mineacea, G. minuta, G. minutissima, G. miocenica mediterranea, G. miotumida explicationis, G. miozea, G. miozea acumarginata, G. miozea conoidea, G. miozea rifensis, G. miozea sphericomiozea, G. miroensis, G. mohleri, G. monmouthensis, G. multiloculata, G. munda, G. nagappai, G. nana pseudocontinuosa, G. nartanensis, G. naussi, G. neominutissima> >>

Globorotalia miotumida explicationis

Citation: Globorotalia miotumida explicationis Jenkins 1967
Taxonomic rank: sub-species
Type specimens: N.Z. Geological Survey Register No. TF 1529:
Type age (chronostrat): Tongaporutuan Stage: G. miotumida miotumida zone (Upper Miocene).
Type locality: NlOO/504, F 11070, grid ref. C 142215: Tongaporutu River mouth and along main road immediately north of the Tongaporutu Bridge.
Type repository: Lower Hutt, New Zealand; New Zealand Geological Survey

Current identification/main database link: Globoconella miotumida (Walters 1965)


Original Description

Test free, low trochospiral, sinistrally coiled,biconvex with the umbilical side the more convex, equatorial periphery lobulate, axial periphery angled with a keel.
Wall calcareous, perforate, umbilical surface and keel spinose, spiral side smooth.
Chambers angular with nearly 5 in the final whorl, increasing slowly in size with the final and antepenultimate chambers of about equal size, final chamber uncoiled towards the umbilical side with its peripheral margin not joined to first chamber of the final whorl; 20 chambers forming the test in 3 whorls; proloculus 0.01 rom diameter.
Spiral side sutures strongly recurved, umbilical side radial to slightly curved.
Umbilicus small. Aperture a low arch, interiomarginal, umbilical-extra-umbilicaI.

Size:
Maximum diameter 0.53 mm.

Etymology:
The subspecific name is derived from the Latin  explicatio meaning uncoiling, referring to the uncoiled condition of the final chamber.

Extra details from original publication
G. miotumida explicationis is closely related to G. miotumida miotumida, but differs from it in having the uncoiled final chamber.G. miotumida explicationis is a distinctive subspecies found in the upper part of the Waiauan Stage and through the Tongaporutuan Stage.
Of the 48 specimens of G. miotumida explicationis in the type sample, 46 are sinistrally coiled.
Some of the smaller specimens do not have the uncoiled final chamber, but others of equal size have.
The largest specimen in the type population has a maximum diameter of 0.57 mm with the numbers of chambers in the final whorl varying between 4 and 5.

References:

Jenkins, D. G. (1967). Jenkins, D. G. (1967). Planktonic foraminiferal zones and new taxa from the lower Miocene to the Pleistocene of New Zealand. New Zealand Journal of Geology and Geophysics. 10(4): 1064-1078. New Zealand Journal of Geology and Geophysics. 10(4): 1064-1078. gs


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Globorotalia miotumida explicationis compiled by the pforams@mikrotax project team viewed: 20-6-2025

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