CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides quadrilobatus hystricosus Belford 1962

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 quadrilobatus hystricosus
Other pages this level: << < 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, G. sacculiferus immatura, G. sacculiferus irregularis, G. semiinvoluta, G. semiinvolutus> >>

Globigerinoides quadrilobatus hystricosus

Citation: Globigerinoides quadrilobatus hystricosus Belford 1962
Rank: sub-species
Type locality: Nogam River, west of Periama village, Wewak Subdistrict, Sepik District, New Guinea
Type age (chronostrat): uppermost Miocene or Pliocene
Type specimens: Pl. 4, figs. 11-14; Holotype CPC 4092 and paratype CPC 4093 - from the same sample.
Described on page(s) : 17

Current identification/main database link: Globigerinoidesella fistulosa (Schubert 1910)


Original Description
This new subspecies is derived from G. quadrilobatus immaturus Le Roy by the development of distinct spines on the penultimate and last chambers. The last chamber is developed in the same way as that of G. quadrilobatus sacculifer and is usually radially elongate. Rare fistulose specimens which lack the terminal chamber have been found; these are also here included in G. quadrilobatus hystricosus subsp. nov. This new subspecies occurs in the same sample as G. quadrilobatus fistulosus; consideration was given to the possibility that these two forms represented different generations of the same species, but,this could not be proved.

Size: Holotype 0.40 x 0.30 mm; paratype 0.43 x 0.32 mm

Extra details from original publication
Remarks: The appearance of fistulose forms marks an evolutionary development which appeared at much the same time in different lines of the quadrilobatus group; two lineages resulted in fistulosus and hystricosus subsp. nov., and Blow (pers. comm.) mentions a third fistulose form developed from the ideotype form of sacculifer which is not represented in material from Papua-New Guinea. The development of fistulose forms seems to have begun in the upper Miocene.

References:

Belford, D. J. (1962). Miocene and Pliocene planktonic foraminifera, Papua-New-Guinea. Australia Bureau of Mineral Resources, Geology and Geophysics Bulletin. 62(1): 1-51. gs

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Globigerinoides quadrilobatus hystricosus compiled by the pforams@mikrotax project team viewed: 18-1-2021

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