(Thelyssa) (Thelyssa) is a biological genus in the family Seguenziidae and order Archaeogastropoda.
Ancistrobasis
Asthelys
Basilissa
Basilissopsis
Calliobasis
Carenzia
Fluxinella
Guttula
Hadroconus
Rotellenzia
Seguenzia
Seguenziella
Seguenziopsis
Thelyssa
Thelyssina