Septa rubecula, common name : the ruby triton or the red redbreast triton, is a species of predatory sea snail, a marine gastropod mollusk in the family Cymatiidae.

[1][3] This species is distributed in the Indian Ocean off Chagos, the Mascarene basin and Tanzania and in the Indo-West Pacific.

[2] These moderately small shells are commonly rather solid, ovate and vetricose.

It may be bright or dark red, orange or brown with a small white or yellowish transversal band on whorls and with small white patches on varices.

The outer lip is ornamented with 8–10 white prominent denticles.