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Species Globuligerina calloviensis Kuznetsova 1980 | ||||||
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| Discussion / Comments: | ||||||
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Boudagher-Fadel et al. (1997): Remarks: The original specimens figured by Kuznetsova (1980, as drawings and SEM images) were reasonably well preserved but their umbilical characters were not clear. However, the metatype which we figure here (Plate 2.5, Figs 5-7) and a topotype illustrated by SEM by Gorbachik (1986, plate 6, fig. 2) show the aperture to be loop-shaped, extending high in the apertural face, sited on the anterior side of the very small umbilicus, just like the apertures of Bathonian and Callovian species of Globuligerina. However, unlike those species, the surface appears to lack, in all the previously published and our new SEM images, any prominent pseudomuricae; the surface can even appear to be smooth, even though the specimens are clearly not internal moulds. The shape of the test of G. calloviensis and the characters of its aperture are both very close indeed to G. oxfordiana (Grigelis). Either these two species will prove to be synonyms or G. calloviensis is the immediate ancestor to the heavily murlcate G. oxfordiana (in which case it may even be considered to be a subspecies of G. oxfordiana). We are retaining both taxa at specific rank because their stratigraphic ages are different although consecutive; this is open to revision. |
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| Synonym list: | ||||||
| Boudagher-Fadel et al. (1997): 1980 Globuligerina calloviensis Kuznetsova. - Kuznetsova & Uspenskaya : p.750 pl. 2; fig. 1-4
1986 Globuligerina calloviensis Kuznetsova. - Gorbatchik : pl. 5, fig. 3;
pl.6, fig. 1, 2
1997 Globuligerina calloviensis Kuznetsova. - Boudagher-Fadel et al. : p.41 pl. 2.5; fig. 5-10; Figure: 2.2
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| References: | ||||||
Kuznetsova,K.I. and Uspenskaya,E.A. (1980): Gorbatchik,T.N. (1986): Boudagher-Fadel,M.K.; Banner,F.T.; Whittaker,J.E. and Simmons,M.D. (1997): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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Taxon relations
Ranking (experimental) |
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