Conoglobigerina caucasica Gorbatchik & Poroshina 1979 from: Boudagher-Fadel, M.K.Banner, F.T.Whittaker, J.E.Simmons, M.D. (1997): Early Evolutionary History of Planktonic Foraminifera. Vol. 1 | . |
Notice: This catalogue page may contain unedited data.
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Species Conoglobigerina caucasica Gorbatchik & Poroshina 1979 |
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| Discussion / Comments: |
Boudagher-Fadel et al. (1997):
Remarks: The test has at least five chambers in
the early whorls, but only four subglobular chambers
in the last whorl. The height of the dorsal spire
is low, but the dorsal side is clearly convex. The
intercameral sutures are distinctly depressed, and
form intercameral sutural angles of about 130° at
the periphery. The umbilicus is small but open and
deep, and the aperture is intraumbilical but (on the
paratype figured by Gorbachik and Poroshina, 1979,
text-fig. 3c) no broader than the narrow umbilicus;
the metatype figured in this chapter, Plate 2.6, Fig.
11, probably like the holotype illustrated in the
original publication, unfortunately has sediment
covering its umbilicus. The aperture is, however,
shown (op.cit., text-fig. 3c) to be conoglobigerine
and not globuligerine. This species must be one
of the stratigraphically youngest known species of
Conoglobigerina, and is noticeable for the lack
of height of the dorsal spire (in profile, the test of
C. caucasica is very like that of early Favusella).
The surface of the test is covered with pseudomuricae
which occasionally fuse into very short,discontinuous, blunt ridges (Plate 2.6, Fig. 12).
Ultimate elongation of these ridges, and their
fusion to form reticulate, favose patterns, will lead
to the evolution of the genus Favusella in the
following geostratigraphic stage (Hauterivian). |
| Systematics: |
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Subordo Globigerinina
Superfamilia Favusellacea
Familia Conoglobigerinidae
Genus Conoglobigerina
Species Conoglobigerina caucasica
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| Synonym list: |
Boudagher-Fadel et al. (1997):
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| References: |
Gorbatchik,T.N. and Poroshina,L.A.. (1979):
New Berriasian planktonic foraminifera from Azerbaijan . Paleontologicheskii Zhurnal Vol. 13 p. 22-287
Boudagher-Fadel,M.K.; Banner,F.T.; Whittaker,J.E. and Simmons,M.D. (1997):
Early Evolutionary History of Planktonic Foraminifera. Vol. 1
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