Elongate shells with a tapering fundus and/or one spine
(This group has no taxonomical significance.)
A. dentistoma A. schwabei A.
Centropyxis sp., ventral view Centropyxis
A. scandinavica, Sjøforsen, Norway, 2023
P. sinuospina — after Chardez,
P. ventricosa — after Thomas
P. setigera — after Wailes,