Korchagin 2004 pl4 f2.JPG
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Korchagin 2004 pl4 f2.JPGCurrent identification/main database link:
Original Description
Test low trochospiral consisting of two whorls, asymmetrical, strongly flattened from spiral side and convex from umbilical side; 4, rarely 4.5 chambers in final whorl; chambers flattened or slightly concave from spiral side, angularly globular from umbilical side, gradually increasing in size; sutures from spiral side beveled, elevated, curved, from umbilical side, depressed, straight, in last 3 chambers bordered by raised hyalineous “bolsters”; outline slightly lobate, oval quadrangular; along chambers’ periphery two tightly arranged massive knobby parallel keels extend, offset to spiral side; surface of chambers from spiral side smooth, covered with scarce non-oriented spines, from umbilical side uniformly medium-spinose; umbilical area small, medium-sized; occupies from one-third of chamber diameter; aperture umbilical-extraumbilical, slitlike, screened by protruding, poorly preserved portici.
Size: Greater diameter: 0.46 mm; smaller diameter: 0.32 mm; thickness: 0.17 mm.
Etymology: Named for a noted micropaleontologist Prof. M. I. Mandelshtam.
Extra details from original publication
Remarks. B. mandelshtamia differs from B. baissunensis (V. Korchagin) in smaller test, less number of chambers in final whorl, and in oval quadrangular outline.
Material. About 10 tests.
Occurrence and age. B. mandelshtamia appeared in the Sciponoceras gracile Zone and occurs in the overlying lower Turonian sediments in the southern Tajik depression, southwestern offsets of the Gissar Range, and northern Afghanistan.
Korchagin, O. A. (2004). On events of the Terminal Cenomanian in the eastern Central Asia. Russian Journal of Earth Sciences. 6: 1-23. gsReferences:
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Bollitruncana mandelshtamia compiled by the pforams@mikrotax project team viewed: 18-1-2021
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