CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides parva Hornibrook 1961

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 -> Globigerinoides -> Globigerinoides parva
Other pages this level: << < G. japonicus, G. joli, G. kennetti, G. korotkovi, G. kuehni, G. macrostoma, G. minuta, G. mitra, G. muratai, G. nuttalli, G. obliqua, G. obliquus amplus, G. obliquus extremus, G. parawoodi, G. parkerae, G. parva, G. pseudodubia, G. pseudoruber, G. pseudosellii, G. quadrilobatus hystricosus, G. quadrilobatus praeimmaturus, G. quadrilobatus primordius, G. ruber albus, G. ruber parkeri, G. rubra seigliei, G. rubriformis, G. sacculifer brachysacculifer, G. sacculifer minimus, G. sacculifer spinulosus, G. sacculifera subsacculifera, G. sacculiferoides> >>

Globigerinoides parva

Citation: Globigerinoides parva Hornibrook 1961
Rank: species
Type locality: Trig. Z, Otiake, N.Z.M.S. 1, Sheet S127 (Provisional Edition 1943), Grid. Ref. c.157016; Oamaru District of South Island, New Zealand.
Type age (chronostrat): Upper Oligocene
Type sample (& lithostrat): uppermost mudstone at Trig. Z
Type specimens: pl. 28, figs 544-546, 550, X 100; Figs. 544-546 holotype; 550, paratype: ; holotype and thirty-four paratypes, no. TF1432; holotype (figs. 544-546), no. TF1432/1; and figured paratype (fig. 550), no TF1432/2
Type repository: Lower Hutt; New Zealand Geological Survey

Current identification:


Original Description
Test conical, exceedingly small, trochospiral, widening rapidly and consisting of two to three whorls of globular chambers, the chambers decreasing from up to six miute ones in the first whorl, to four in the second, to three in the final whorl. Aperture a simple, rounded, arched opening at the base of the final chamber, often very small in juveniles. Minute supplementary opening at the base of the final chamber, often very small in juveniles. Minute supplementary apertures are developed at the junction of some of the radial and spiral sutures of the final whorl. Test wall thin and delicate, very finely porous and reticulate in adults, nearly smooth in juveniles.

Size: Dimensions of holotype, diameter 0.29 mm.

Extra details from original publication
Variability. - The relative height of the spire varies considerably. In the type sample the coiling ratios are twenty-four clockwise to eleven anticlockwise.

Remarks. - Distinguished by its small size and rapid trowth rate. The species identified by Bolli (1957, U. S. Nat. Mus., Bull., no. 215, p. 110, pl. 23, fig. 5a-c) as Globigerina bradyi Wiesner from the Cipero Marl of Trinidad is similar to Globigerinoides parva in its minute size and in having occasional supplementary aperture. Both Wiesner's and Bolli's figures of Globigerina bradyi illustrate a markedly more trochospiral test than in Globigerinoides parva, the chambers expanding much less rapidly with growth. The Recent Globigerinoides minuta Natland appears to be closely similar to Globigerinoides parva but it, too, has a slower rate of chamber expansion.

Globigerinoides parva is possibly the ancestor of a species very similar to Globigerinoides rubra d'Orbigny, present in lower Southland Series on the east coast of the North Island. The Southland species differs in being much larger htan parva, in having better developed supplementary apertures, and in having more coarsely reticulate surfaces."

References:

Hornibrook, N. d. B. (1961). Tertiary Foraminifera from Oamaru District (N.Z.). Part 1 Systematics and distribution. New Zealand Geological Survey, Paleontological Bulletin. 34(1): 1-192. gs


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Globigerinoides parva compiled by the pforams@mikrotax project team viewed: 5-3-2021

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