Dinogymnium cerviculum Cookson and Eisenack, 1970

Now Alisogymnium. Originally Dinogymnium, subsequently (and now) Alisogymnium.
Holotype: Cookson and Eisenack, 1970, pl.10, fig.6; Lentin and Vozzhennikova, 1990, Appendix A, fig.34
Locus typicum: Madura No. 1 Bore, Eucla Basin, Western Australia
Stratum typicum: Senonian

Original description: Cookson and Eisenack, 1970, p.138
Shell small, epitheca approximately three times as long as the hypotheca, narrowing gradually from the relatively deep, circular girdle to a distinct though short, straight-sided neck, the apex of which appears to have been detached along a straight line. Hypotheca in the form of a low half-sphere.
The surface of both epitheca and hypotheca is rather faintly longitudinally striated, especially that of the hypotheca, the striation being most conspicuous near the base of the epitheca. The longitudinal furrow appears to be developed as the result of the downward curving of the girdle.
Dimensions: Holotype: shell c. 33 Ám long, c. 27 Ám broad, overall length c. 40 Ám.