Basilissopsis rhyssa is a species of sea snail, a marine gastropod mollusc in the family Seguenziidae.

[1] The height of the shell attains 2.1 mm.

The shell is nacreous and the outer lip possesses posterior and basal labral sinuses.

[2] This marine species occurs in the Gulf of Mexico,[1] in the Caribbean Sea off Cuba and in the Atlantic Ocean off Georgia.

This Seguenziidae-related article is a stub.