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Species Globoquadrina extans Jenkins 1960 | ||||||
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| Discussion / Comments: | ||||||
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Chaisson & Leckie (1993): Remarks: This persistent basal Miocene taxon is characterized by four and a half to five and a half chambers in the final whorl, an off-center umbilical aperture bordered by a thin almost toothlike lip, and a distinctly cancellate wall. It differs from Jenkins's (1960) type specimens in having a low to moderate spire as opposed to being nearly flat on the dorsal side. Similar species: Globoquadrina cf. G. extans differs from Dentoglobigerina altispira globosa, the ancestor of D. altispira altispira (Kennett and Srinivasan, 1983), in being smaller, in lacking the well-developed apertural toothlike projections, and in having an aperture located squarely in the center of the ventral side of the test. Further work may prove that G. cf. G. extans is in fact closely related to the D. altispira group. |
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| Synonym list: | ||||||
| Chaisson & Leckie (1993): 1960 Globorotalia extans Jenkins. - Jenkins : p.360 pl. 4; fig. 4a-c and 5a-c
1993 Globoquadrina cf. extans Jenkins. - Chaisson & Leckie : p.177 pl. 9; fig. 9-11
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| References: | ||||||
Jenkins,D.G. (1960): Chaisson,W.P. and Leckie,R.M. (1993): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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Taxon relations
Ranking (experimental) |
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