Saturnulus = Small Saturnus, with a ring.
Amphisphæra = Sphere with spines on both poles; ἀμφί, σφαῖρα.
Amphistylus = Shell with styles on both poles; ἀμφί, στῦλος.
Saturninus = Similar to Saturnus, with a ring.
Stylocromyum = Onion with styles; στῦλος, κρόμυον.