CATALOG OF ORIGINAL DESCRIPTIONS: Globicuniculus Saito & Thompson, in Saito et al. 1976

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.


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Globicuniculus

Citation: Globicuniculus Saito & Thompson, in Saito et al. 1976
Rank: Genus
Type species: Globigerinoides mitra Todd. 1957

Current identification/main database link:


Original Description
Test free. trochospiral. earlier whorls with globular chambers. later chambers becoming axially elongate; primary aperture interiomarginal. umbilical; previous apertures remaining open into the umbilicus; smaller secondary sutural apertures on the spiral side, generally one per chamber; wall calcareous. perforate; surface hummocky in earlier chambers but smooth in later chambers; elongate globigerine spines and spine bases absent throughout the ontogeny.

Etymology: Globus-Latin. a globe or ball; + cuniculus - Latin. rabbit; gender. masculine. The generic name is given because of the profile of the type species resembling a head of a rabbit with large ears

Extra details from original publication
Remarks: Todd (1957) described this species under the genus Globigerinoides because of the presence of supplementary apertures on the spiral side. Our scanning electron microscopic examination of this species reveals, however, that it lacks the characteristic elongate spines or the spine bases of Globigerinoides demonstrated by Bé (1965. text-figure 3) and Hemleben (1969. plate 10. f igures 1-3, 5-7; plate 14. figures 1-7).

Scanning electron micrographs show that surface features of G. mitra are also different from those of Globigerinoides in having level interpore areas between circular pores of nearly uniform diameter. In Globigerinoides, interpore areas are in the form of narrow ridges with flat. broad bases.

The surface structure of G. mitra is also distinguished by the presence of scattered pore areas "plugged up" by lumplike calcite growths (see upper left corner of plate 7. figure 7). These lumplike calcite fillings of areas where pore openings are otherwise expected are also found in Protentella prolixa (plate 7.  igure 4). However, Protentella differs in having additional mound-like calcite growths on top of the interpore areas as well.

References:

Bé, A. , W. H. (1965). The influence of depth on shell growth in Globigerinoides sacculifer (Brady). Micropaleontology. 11(1): 81-97. gs

Hemleben, C. (1969). Zur morphogenese planktonischer Foraminiferen,. Zitteliana. 1: 91-133. gs

Saito, T., Thompson, P. R. & Breger, D. (1976). Skeletal ultra-microstructure of some elongate-chambered planktonic foraminifera and related species. In, Takayanagi, Y. & Saito, T. (eds) Progress in Micropaleontology, Special Publication. Micropaleontology Press, The American Museum of Natural History, New York 278-304. gs

Todd, R. (1957). Smaller foraminifera, in Geology of Saipan, Mariana Islands, Pt. 3, Paleontology. U. S. Geological Survey, Professional Paper. 280-H: 265-320. gs


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Globicuniculus compiled by the pforams@mikrotax project team viewed: 17-11-2019

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