Lusitanops gigasei is an extinct species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

[2] The shape and size of Lusitanops gigasei suggests it was a mobile and active predator, capable of hunting and capturing other small marine invertebrates.

The pointed spire of the shell may have helped it to penetrate sand and sediment to access prey buried in the seafloor.

[further explanation needed] Its shell was thick and sturdy, suggesting that it may have been adapted to living in environments with strong water currents and turbulence.

[citation needed] L. gigasei may be a species intermediate between Lusitanops and Xanthodaphne, as it had a combination of characteristics of these two genera.