Lotoria grandimaculata, common name : the large spotted triton, is a species of predatory sea snail, a marine gastropod mollusk in the family Cymatiidae.

The whorls are angulated at the upper part, transversely faintly striated and ridged.

The varices and the upper part of the columella are ornamented with large spots of very dark brown.

The outer lip is dentated within, teeth very dark brown.

[2] This species occurs in the Red Sea and in the Indian Ocean off East Africa; also off the Philippines.