[4] A high number of undescribed species are estimated to belong to Gemmula.

[6] These bioactive peptides are likely to become a resource for novel pharmacologically active compounds [7] The snails in this genus occur mostly in deeper tropical waters at depths between 50 and 500m.

The sculpture is most emphasized in a spiral direction, often with a prominent beaded keel at or in front of the anal fasciole.The rather long siphonal canal is narrow and tapering, sometimes curved.

The sinus is straight, more or less narrow and long, terminating in a nodulous peripheral keel that is gemmate throughout.

Type species : Pleurotoma gemmata Hinds, 1843 [8][9] The bead-row of the fasciole readily distinguishes this genus from related forms.