CATALOG OF ORIGINAL DESCRIPTIONS: Orbulina universa parkerae Brönnimann & Resig 1971
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Citation: Orbulina universa parkerae Brönnimann & Resig 1971Taxonomic rank: sub-speciesType specimens: Plate 45, Figures 1 through 4 (holotype fig. 2)Type sample (& lithostrat): DSDP 62.1-14-5 15-7cm Type age (chronostrat): Zone N. 18.Type repository: Washington, USNM
Current identification:
Original Description The large-sized test consists of two subglobular chambers of which the penultimate is distinctly smaller than the ultimate. The ultimate chamber envelops about one half of the penultimate one. The calcareous wall of the penultimate chamber is uniformly perforate and, as shown by the scanning micrographs of the surface of the ultimate chamber (Plate 45, Figure 3), it is densely perforated by deeply-set small wall pores and irregularly distributed larger wall pores of about 150 micron maximum diameter. The suture between the two chambers is distinct, but neither depressed nor incised, and without the larger perforations. The surface of the walls is covered by blunt pustules which, according to the scanning micrographs—Plate 45, Figures 3 and 4,are composed of smaller crystalline units Size: The maximum diameter of the test is 680 microns, that of the penultimate chamber is 390 microns, and that of the ultimate chamber is 570 microns. Etymology: The new subspecies is named for Frances L. Parker,Scripps Institution of Oceanography, La Jolla, California. Extra details from original publication Orbulina universa parkerae, n. subsp., is usually united with Orbulina universa bilobata d'Orbigny, 1846 (= Biorbulinabilobata (d'Orbigny)) in the same taxon. A different stratigraphic range, however, suggests that Orbulina universaparkerae represents a distinct sub-species of Orbulina universas.l. It appears after Orbulina universa bilobata, and is here interpreted as an evolutionary off-shoot of bilobata. Parker (1967,pi. 22, fig. 8) illustrated the new subspecies which she recorded in the Recent, whereas the bilobate individual, illustrated by her Plate 22, Figure 7, is considered as a Miocene form only. Parker suggested to us that the "pinched"" bilobate orbuline may be different from the symmetric bilobata. The asymmetry between the ultimate and the penultimate chambers of Orbulina universa parkerae is variable, but the differentiation of the new subspecies from Orbulina universa bilobata does not present difficulties.
Stratigraphic Range: Orbulina universa parkerae, n. subsp., has been recorded in most samples from Hole 62.1, Core 8, Section 4 to Core 29, Section 4, that is, from Zone N. 20 (including N. 19) down to the base of Zone N. 16. Orbulina universa bilobata occurs in Hole 62.1, from Core 11, Section 2 to the base of Core 35, that is, from the lower part of Zone N. 20 (including N. 19) to Zone N. 13. The two subspecies therefore overlap in Hole 62.1 from the lower part of N. 20 (including N. 19) to the base of N. 16. Orbulina universa parkerae extends higher in Zone N. 20 (including N. 19) then universa bilobata.
References:
Brönnimann, P. & Resig, J. (1971). A Neogene globigerinacean biochronologic time-scale of the southwestern Pacific. Initial Reports of the Deep Sea Drilling Project. 7(2): 1235-1469. gsO
Orbulina universa parkerae compiled by the pforams@mikrotax project teamviewed: 7-2-2025
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