Cenozoic first appearances

Lambis is a genus of large sea snails sometimes known as spider conchs, marine gastropod mollusks in the family Strombidae, the true conch family.

Laevistrombus is a genus of sea snails, marine gastropod mollusks in the family Strombidae, the true conchs.

Pseudotorinia is a genus of sea snails, marine gastropod molluscs in the family Architectonicidae, the staircase shells or sundials.