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Species Conoglobigerina dagestanica Morozova 1961 | ||||||
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| Discussion / Comments: | ||||||
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Boudagher-Fadel et al. (1997): Remarks: Morozova (1961) obtained her type specimens from the Bathonian of central Dagestan. Globuligerina araksi was described by Kasimova (in Kasimova and Ayileva, 1984) from the Upper Bajocian of Azerbaijan. We consider them synonymous. Both (Plate 2.3, Figs 1-13) are high spired, with four chambers in the final whorl. morozova (1961) believed the first whorl of the test to have five chambers, with this number reducing to four or even three in the last formed whorl. Morozova (op. cit.) figured many paratypes by photography (1961, pl. 2, figs 14-19) and line drawings (text-figs 7; 4-249; like the paratypes illustrated in this book (Plate 2.3, Figs 8-13), all have four chambers in the last whorl. The only specimens illustrated by Morozova (1961, op.cit.) as having three chambers in the last whorl was the drawing of the umbilical surface of the holotype (text-fig. 7; 3); however, our new photograph of the same surface of the holotype (Plate 2.3, Fig.7) shows it to have four chambers in the last whorl, just like the paratypes. Therefore, we conclude that there is no evidence for a primary type of this species processing only three chambers in the last whorl. Rare paratypes of C. avarica Morozova (Plate 2.4, Fig. 5) and C. balakhmatovae (Morozova) (Plate 2.4, Figs 13-15) are referable to C. dagestanica. They all have four chambers abutting the umbilicus, and spires which are as high as in some paratypes of C. dagestanica. C. dagestanica (and, of course, its synonym C. araksi) has a high spire with at least five chambers in each of the earliest whorls (at least in both holotypes), reducing to four in the final whorl. The chambers are inflated and subglobular, with depressed intercameral sutures. The surface of the wall is covered with speudomuricae (Plate 2.3, Fig. 11), which often fuse laterally into very short ridges. The aperture is a low intraumbilical arch with no known lip; there are suggestions that a small bulla may occasionally be present (Plate 2.3, Fig. 10). it is possible that C. dagestanica was dimorphic, the microspheric generation (like the holotype illustrated by Morozova, and the paratypes figured by us, Plate 2.3) having five to six chambers per whorl initially, but the megalospheric generation (like that figured by Morozova, 1961, plate 2, Fig. 17) having only four. The height of the spire, in each case, was much the same. It does not seem possible to distinguish microspheric and megalospheric generations by the height of the spire alone. It was suggested by Banner and Desai (1988, p. 147) that dimorphism in Conoglobigerina indicated that the genus was meroplanktonic (at least in the microspheric generation) and therefore close to the benthonic ancestor of the Favusellacea, but this thesis is not yet proven. |
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| Systematics: | ||||||
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22 Subordo Globigerinina Superfamilia Favusellacea Familia Conoglobigerinidae Genus Conoglobigerina Species Conoglobigerina dagestanica |
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| Synonym list: | ||||||
| Boudagher-Fadel et al. (1997): 1961 Globigerina (Conoglobigerina) dagestanica Morozova. - Morozova & Moskalenko : p.26 pl. 1, fig. 13-15 (holotype);
pl. 2, fig. 14-19;
text-fig. 7;
1-24
p 1961 Globigerina (Eoglobigerina) balakhmatovae Morozova. - Morozova & Moskalenko : p.23 pl. 1; fig. 9-11 (paratype) only
p 1961 Globigerina (Conoglobigerina) avarica Morozova. - Morozova & Moskalenko : text-fig. 8;
8, 9, 15, 17, 18 (paratypes) only
1980 Conoglobigerina dagestanica Morozova. - Grigelis & Gorbatchik : pl. 1; fig. 1, 2
1984 Globuligerina araksi Kasimova. - Kasimova & Aliyeva : 12, 13 fig. 10a-c
1986 Conoglobigerina dagestanica Morozova. - Gorbatchik : pl. 1; fig. 1-3
1997 Conoglobigerina dagestanica Morozova. - Boudagher-Fadel et al. : 21, 37, 39 pl. 2.3, fig. 1-13;
pl. 2.4., fig. 5, 13-15;
figure 2.2
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| References: | ||||||
Morozova,V.G. and Moskalenko,T.A.. (1961): Grigelis,A.A. and Gorbatchik,T.N. (1980): Kasimova,G.K.. and Aliyeva,D.G.. (1984): 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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