Lambe (1902) named S. validum from two figured specimens (and one unfigured). No type specimen was selected.
Lambe (1918) then split those two figured specimens into separate species, designating CMN 1423 as the holotype of S. browni, and leaving CMN 515 to be the lectotype of S. validum.
Lambe (1902) named S. validum from two figured specimens (and one unfigured). No type specimen was selected.
Lambe (1918) then split those two figured specimens into separate species, designating CMN 1423 as the holotype of S. browni, and leaving CMN 515 to be the lectotype of S. validum.