Catalog - Globorotalia inconspicua aculeata Catalog - Globorotalia inconspicua aculeata

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia inconspicua subsp. aculeata 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 -> Globorotalia -> Globorotalia inconspicua aculeata
Other pages this level: << < 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, G. irrorata, G. juanai, G. kajmatica, G. kilabiyaensis, G. kingmai, G. kolchidica, G. kotucensis, G. kugleri, G. lacerti, G. laeta> >>

Globorotalia inconspicua aculeata

Citation: Globorotalia inconspicua subsp. aculeata Jenkins 1966
Taxonomic rank: sub-species
Type specimens: TF 1506: Holotype and 2 paratypes.
Type age (chronostrat): Bortonian Stage ( Middle Eocene).
Type locality: Holotype and paratype (Nos. 119-124) from S146/662,F 5179A, grid ref. 432424, Sheet 146 (edit. 1943), Hampden Beach section;upper blue micaceous clay, 1 mile N of Kakaho Creek, 10 ft below uppermost exposure of clay. Collected by J. Park. Paratype (No. 125) from F 5179B, S146/531 (1st coIl.) , grid ref.439437, Hampden Beach; upper blue micaceous clays, 1 1/4 miles N of Kakaho Creek. Collected by J. Park.
Type repository: Lower Hutt, New Zealand; New Zealand Geological Survey

Current identification/main database link: Dipsidripella danvillensis (Howe&Wallace 1932)


Original Description


Test free, small, sinistrally coiled, low trochospiral, biconvex, equatorial periphery quinquelobate, axial periphery
rounded. Wall calcareous, thin, perforate, surface spinose. Chambers inflated, 12, arranged in 2 whorls, with 5 in the first and 5 1/2 in the second whorl; proloculus diameter 0·02 mm. Sutures on the spiral side radial to slightly recurved, depressed; radial on the umbilical side, depressed. Umbilicus small, open. Aperture, a low arch, interiomarginal, umbilical-extraumbilical.

Size:
Maximum diameter 0·20 mm.

Extra details from original publication
REMARKS: Globorotalia inconspicua aculeata n. subsp. and Globorotalia inconspicua inconspicua Howe occur together in the New Zealand rocks and are closely related. Paratypes of G. inconspicua inconspicua Howe were kindly provided by Dr van den Bold of Louisiana State University for comparison with G. inconspicua aculeata. G. inconspicual aculeata differs from G. inconspicua inconspicua in having 4 1/2-6 chambers in the final whorl compared to 6-8 chambers in the latter; the test surface is spiny, without the thickened keel of G. inconspicua inconspicua and it has 5 chambers in the first whorl instead of 6. In both subspecies the diameter of the proloculus ranges from 0·01 to 0·02 mm.
Test coiling of G. inconspicua aculeata in the type samples is: F 5179A, 7 dextral and 35 sinistral; F 5179B, 5 dextral and 20 sinistral specimens.
The preference for sinistral coiling is common to both subspecies and is maintained throughout their ranges.
In the type and other samples there is a wide range of variation in the degree of development of spines on the test surface which are occasionally larger than the holotype spines as in the paratype from sample F 5179B (No. 125).
The subspecific name is taken from the Latin aculeatus meaning "prickly""."

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:

Huber, B. T., Olsson, R. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene microperforate planktonic foraminifera (Jenkinsina, Cassigerinelloita, Chiloguembelina, Streptochilus, Zeauvigerina, Tenuitella, and Cassigerinella) and Problematica (Dipsidripella). In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 16): 461-508. gs O

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


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Globorotalia inconspicua aculeata compiled by the pforams@mikrotax project team viewed: 10-9-2026

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