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Species Praehedbergella tatianae Banner & Desai 1988


Diagnosis / Definition:
Banner & Desai (1988):
The test consists of about two whorls of chambers, 4 1/2 chambers in the first whorl and 4 in the final whorl. The spiral side is almost flat: the umbilical side is more convex and has a narrow, deep umbilicus which is in breadth equal to about 1/8 th of the test diameter. The chambers become reniform and depressed with growth, to become about half as high as long when seen on the spiral side. The aperture is a narrow slit, umbilical to extraumbilical, nearly but not quite reaching the periphery of the previous whorl, and is furnished with a porticus which is broadest at its umbilical end. The surface of the test is smooth and nonmuricate: it is uniformly microperforate. the microperforations being about 0.6µm in diameter but often broadened at their outer ends (through test erosion) to about 1.5µm.
Discussion / Comments:
Boudagher-Fadel et al. (1997):
Remarks: This species is characterized by its very depressed chambers (h/L = 0.4 approx.) and very broad peripheral intercameral sutural angles (160° approx.). No specimens with perforation cones are yet known. The umbilicus is small and the slit-like aperture possesses a broad porticus.
Systematics:

22
 Superfamilia Globigerinaceae
  Familia Praehedbergellidae
   Subfamilia Praehedbergellinae
    Genus Praehedbergella
     Species Praehedbergella tatianae
Synonym list:
Banner & Desai (1988):
1974 Hedbergella sp. cf. sigali Moullade. - Longoria : p 68 pl 22 figs 1-5
1982 Hedbergella cf. sigali Moullade. - Obata et al. : p.156 pl 4 figs 21-c
1988 Praehedbergella n sp. tatianae Banner & Desai. - Banner & Desai : 156, 157 pl 3 figs 1-3
Boudagher-Fadel et al. (1997):
1974 Hedbergella sp. cf. sigali Moullade. - Longoria : pl. 22; fig. 1-5
1982 Hedbergella cf. sigali Moullade. - Obata et al. : p.156 pl. 4; fig. 2a-c
1988 Praehedbergella tatianae Banner & Desai. - Banner & Desai : p.152 pl. 3; fig. 1-3
1997 Praehedbergella tatianae Banner & Desai. - Boudagher-Fadel et al. : p.119 pl. 7.4; fig. 5-7; Figure: 7.1
References:

Longoria,J.F. (1974):
Stratigraphic, morphologic and taxonomic studies of Aptian planktonic Foraminifera . Revista Espanola de MicropaleontologíaNo extraord p. 1-107

Obata,I.; Maiya,S.; Inoue,Y. and Matsukawa,M. (1982):
Integrate mega- and micro-fossil biostratigraphy of the Lower Cretaceous Choshi Group, Japan . Bull. Nation. Sci. Mus.C8(4) p. 145-179

Banner,F.T. and Desai,D. (1988):
A review and revision of the Jurassic-Early Cretaceous Globigerinina, with special reference to the Aptian assemblages of Speeton (North Yorkshire, England) . J. micropalaeontol. Vol. 7(2) p. 143-185

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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