Catalog - Neoschackoina

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Neoschackoina

Citation: Neoschackoina Georgescu 2012

Type age (chronostrat): Upper Santonian-lower Maastrichtian (from the D. asymetrica Biozone to the upper part of G. gansseri Biozone).

Type locality: Europe (Italy, Poland), South Atlantic Ocean (Falkland Plateau, Maud Rise), Indian Ocean (Kerguelen Plateau) and USA (Alabama, Kansas, Wyoming).

Type species.- Schackoina sellaeforma Masters, 1976, by original designation.

Species included. IS: Neoschackoina tappanae (Montanaro Gallitelli, 1955) and FDS: N. sellaeforma (Masters, 1976).

Diagnosis. Schackoinid planktic foraminifera with globular chambers with mono- tubulospines or β-bitubulospines.

Description. Test planispiral, evolute-involute and biumbilicate consisting of globular chambers. Chambers are globular throughout and terminate with monotubulospines in N. tappanae and subrectangular to trapezoidal terminating with β-bitubulospines in N. sellaeforma. Sutures are distinct, depressed, straight and radial on both test sides. Test is symmetrical in edge view, slightly compressed in N. sellaeforma. Aperture is a medium high to high arch in equatorial position, and is bordered by a sparsely perforate lip; relict periapertural structures occur in the umbilici. Chamber surface is symmetrically ornamented with irregular pustules; less dense pustules occur occasionally around the tubulospine base. Test wall is calcitic, hyaline, simple and perforate; pores are simple, and circular.

The Greek prefix neo-(=new) is added to the pre-existing name Schackoina.

Remarks. Neoschackoina differs from Groshenyia and Asymetria mainly by having the chambers terminating with tubulospines, rather that radially elongate and with one distal bulbous projection. It differs from Schackoina mainly by the test consisting of globular rather than flask-like chambers at least in the adult stage, and chambers terminating with monotubulospines and β-bitubulospines rather than monotubulospines, α-bitubulospine and tritubulospines. It differs from Pseudohastigerinoides mainly by having globular chambers rather than bearing radially elongate resembling tubulospines.

References:

Georgescu, M. D. (2012b). Morphology, taxonomy, stratigraphic distribution and evolutionary classification of the schackoinid planktic foraminifera (late Albian- Maastrichtian, Cretaceous). In, Bailey, D. R. , Howard, S. E. , (ed.) Deep-sea marine biology, geology, and human impact. Nova Publishers, New York 1-62. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Neoschackoina Georgescu 2012

Neoschackoina

References:

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