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Current identification/main database link: Globoconusa daubjergensis (Bronnimann 1953)
Translated from French using google translate original French text below This small species is characterized by a very high spiral dimension and a rapidly increasing dimension of the chambers, with or without additional chambers with or without umbilicus, the number of towers being from 2½ to 3, the number of rooms per turn of 3 or 4, main opening, umbilicus. There are often multiple sutural openings and their orifices are small, often pore-shaped; Large papilla wall, finely porous, with a diameter of up to 0.3 mm. and can reach a height of 0.3 mm. Translated from French using google translate original French text below Their taxonomic position is given by test structure and general characteristics, and the species is reported to genus Globigerina s. l. Within the different types, there is a wide variation, especially in the relation between diameter and height, which varies in such a way that the lower forms have a height a little smaller than the dimension of the largest diameter. (eg Fig. 2, Fig. 14) and in extremely tall forms the diameter-height varies from 1 to 1.5 (Fig. 2, Fig. 7-12). The characteristic feature of these forms is that they are usually quite small, the proloculum rarely has a diameter greater than 30 microns. The most common types belong to the forms represented (Plate I, Fig. 1-8). They often have an umbilical opening acette suturales openings weakly indicated. They are almost as tall as they are wide, and their proloculum is within 30 to 40 microns. These types have no additional rooms and they have mostly three, more rarely four chambers in the last turn. The genotype belongs to this category. Finally we have the forms whose proloculum is extremely large and whose diameter can go up to 70 microns. They are characterized by additional chambers, one of which is usually located above the umbilicus. Other additional chambers are found infrequently, which are placed 9a and over the sutures. The first type is represented Pl.1, fig. 9-14, while the others are Pl. 2, fig. 1-6. The standard chambers are clearly papillose and all the additional rooms are almost flat and finely porous. The structure of the shell of the normal chambers is in principle similar to the recent form, Globigerina bulloides. The wall of the shell itself is thinner, the papillae are, compared to the thickness of the shell larger and irregular, the pores lesser. The papillae are rather irregularly arranged on the whole shell, but they can be strongly prolonged on the lower side of the chambers. "Relationships .-- This new species is directly related to Globigerina daubjergensis Bronnimann Hofker (1960, Cushman Found, Foram Res., Contr., Vol 11, pt 3, pp. 73-86) represented a whole series of forms that show sutural openings and even an additional chamber Loeblich et al., (1957, US Nat., Mus., Bull., No. 215) have even described and described sutural openings in Globigerina daubjergensis, but no additional chambers. The main difference between the new species and Globigerina daubjergensis is the extremely high spiral dimension in the new form, although the typical Globigerina daubjergensis are of rather low forms, but in the ancient Paleocene (not the Danian) high isolated examples exist. never in the typical form that each copy of Globigerina kozlowskii shows.We have species with a high spiral dimension of tertiary origin, such as Globigerina spiralis Bolli. gerina spiralis is distinguished by a much larger number of chambers per turn. In some cases, Globigerina spiralis of the Vincentown formation represented by Loeblich and Tappan (1957, US Nat.Museum, Bull., No. 215, p.182, p.51, Figs 6-9), is very close to our species. Figure 6 above shows a large additional chamber of the same shape as those we observed in Poland. The whole group of Globigerina rubra d 'Orbigny which already appears in the Eocene is much higher than the new species. Finally, it can be said that Subbotina represented a Globigerinoides rubriformis of the Upper Eocene, which shows certain parent traits with Globigerina kozlowskii, but does not have additional chambers or additional openings. "
Original Description
Extra details from original publication
"Relations. - Cette nouvelle espece se rattache directement a Globigerina daubjergensis Bronnimann. Hofker (1960, Cushman Found. Foram. Res., Contr., vol. 11, pt. 3, pp. 73-86) a represente toute une serie de formes qui montrent des ouvertures suturales et meme une chambre additionnelle. Loeblich et ses collaborateurs (1957, U.S. Nat. Mus., Bull., no. 215) ont meme repnresente et decrit des ouvertures suturales chez Globigerina daubjergensis, mais pas de chambres additionnelles. La principale difference entre Ia nouvelle espece et Globigerina daubjergensis est le cote spiral extremement haut chez la nouvelle forme. Bien que les Globigerina daubjergensis typiques soient de formes assez basses, il existe dans le Paleocene ancien (non le Danien) des exemples hauts isoles, mais jamais sous la forme typique que montre chaque exemplaire de Globigerina kozlowskii. On conn a it des especes a cote spiral eleve d 'origine tertiaire pi us recente, par exemple, Globigerina spiralis Bolli. La Globigerina spiralis se distingue par un beaucoup plus grand nombre de chambres par tour. Dans certams cas, Globigerina spiralis de la formation de Vincentown representee par Loeblich et Tappan (1957, U.S. Nat. Mus., Bull., no. 215, p. 182, pl. 51, figs. 6-9), est tres proche de notre espece. La figure 6 surtout montre une grande chambre additionnelle de meme forme que celles que nous avons observees en Pologne. Toutle groupe de Globigerina rubra d' Orbigny qui apparalt deja dans l'Eocene est beaucoup plus haut que la nouvelle espece. Finalement, on peut indiquer que Subbotina representait une Globigerinoides rubriformis de l'Eocene superieur qui montre certains traits de parente avec Globigerina kozlowskii, mais ne possede pas de chambres additionnelles ni d'ouvertures additionnelles."
Brotzen, F. & Pozaryska, K. (1961). Foraminiferes du Paleocene et de l'Eocene inferieur en Pologne septentrionale; remarques paleogeographiques. Revue de Micropaléontologie. 4: 155-166. gsReferences:
Globigerina kozlowskii compiled by the pforams@mikrotax project team viewed: 5-10-2024
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