Type species.- Schackoina moliniensis Reichel, 1948, by original designation.

Species included. IS: Pseudohastigerinoides gandolfii (Reichel, 1948) and FDS: P. moliniensis (Reichel, 1948).

Diagnosis.  Schackoinid  planktic  foraminifera  with  strongly  elongate  chambers resembling tubulospines in the adult stage.

Description. Test is very low trochospiral in the early stage and planispiral in the adult stage. Early chambers are globular and subglobular, those of the final whorl conical or highly conical, and occasionally flask-like, the last formed one or two strongly radially elongate, resembling tubulospines; there is one chamber extension on each chamber in P. gandolfii and two or three elongate extensions, the two anterior ones symmetrically arranged with respect to the equatorial plane in P. moliniensis. Sutures are distinct, depressed, straight and radial on both test sides. Test is symmetrical in edge view; an equatorial groove developed on the chambers with symmetrically developed chamber extensions occurs in P. moliniensis. Aperture is a low arch at the base of the last-formed chamber, equatorial in position, and bordered by a narrow imperforate lip; relict periapertural structures occasionally occur in the umbilici. Chamber ornamentation consists of scattered dome-like pustules, which are concentrated around the umbilici, and are symmetrically developed over the two test sides. Test wall is calcitic, hyaline, simple and perforate; pores are simple and with circular outline.

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