Theta vayssierei is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

[1] The taxonomy of this species was clarified by Dautzenberg in 1925, who assigned it to the genus Theta.

This species is found in the Mediterranean Sea.

Little is known about the biology and ecology of this species.

Further research may provide more information about its distribution, behavior, and potential interactions with other species.