Basilissopsis is a genus of sea snails in the family Seguenziidae.

[1] In 1897 Dautzenberg and Fischer created this new genus for their specimen of Basilissopsis watsoni, based on the shell characteristics of discolored specimens that were non-nacreous and lacked labral sinuses.

[2] This was however contradicted later by the discovery of other species in this genus that possess nacre and labral sinuses.

The conical shell has peripheral carina and collabral axial riblets.

All whorls contain midwhorl angulation but spiral lirae are absent.