LytechinusLytechinus is a genus of sea urchins.SpeciesThe following extant species are listed in this genus by the World Register of Marine Species: Lytechinus callipeplus H.L. Clark, 1912 Lytechinus euerces H.L. Clark, 1912 Lytechinus panamensis Mortensen, 1921 Lytechinus pictus Lytechinus semituberculatus Lytechinus variegatus Lytechinus williamsi Chesher, 1968