Gymnobela ioessa is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.
The specific name is derived from ioessa, the feminine form of the Greek ioeis, meaning violet or dark brown, referring to the color of the shell.[1]
The species' shell is 45mm tall and consists of 10 whorls, with a pronounced spire. The anal sinus is broad and deep. General coloration is reddish-violet, with brown coloration inside the aperture. The radular teeth are long and thin with barbs at the ends, measuring about 170 micrometres long. The aperture is 21.2mm tall by 16mm wide.
G. ioessa is found in the Tanimbar Islands of Indonesia. and in the Arafura Sea, at depths between 836 m - 869 m.