Scutellastra optima
Scutellastra optima is a species of true limpet, a marine gastropod mollusk in the family Patellidae. Description
The shell of the holotype measures . Distribution
Scutellastra optima occurs in the northwestern Pacific. The holotype was obtained from Yakushima (Japan). References

Nakano T. & Ozawa T. (2007). Worldwide phylogeography of limpets of the order Patellogastropoda: molecular, morphological and paleontological evidence. Journal of Molluscan Studies 73(1): 79–99. Patellidae
Molluscs of the Pacific Ocean
Gastropods described in 1925
Taxa named by Henry Augustus Pilsbry