ALLIATINA Troelsen, 1954

 

 

Type species: Cushmanella excentrica di Napoli Alliata, 1952 (*2229), p. 105; OD.Alliatina Troelsen. 1954(*3226), p. 464. Pseudononionella S. Y. Zheng, in S. Y. Zheng. Cheng.Wang. and Fu. 1978 (*3453), p. 62. 77; type species:Pseudononionella variabilis S. Y. Zheng. in S. Y. Zheng et al.. 1978; OD.

Test almost planispiral but slightly asymmetrical and tending to coil dextrally, par­tially evolute, chambers enlarging rapidly and test somewhat flared, internal partition inverted V shape, folding around the apertural open­ing. oblique and attached to the inside of the apertural face on the margin toward the umbil­ical side, opposite free margin extending inward from the aperture where both parts attach to the previous septum below the septal fora-men and diverge toward the side walls of the test, partitions of earlier chambers partially resorbed with growth, sutures nearly radial, slightly curved, depressed, periphery rounded: wall calcareous, aragonitic, finely perforate, optically radial, surface smooth; aperture a small oblique oval areal opening in the cham­ber face, and an interiomarginal equatorial slit at the base of the chamber, interiomarginal opening closed as new chamber is added and areal opening enlarged as an intercameral foramen. Pliocene to Holocene; Europe; North America: China: Shandong Province; Pacific.