Othelosoma conyum is around 22–26 mm long and around 1.4 mm wide. The body is bluntly rounded at the front and tapers towards the back. The dorsal side is a rusty browncolor that lightens as it approaches the ventral side; the ventral side is a whitish color. The front end of the dorsal side is slightly darker than the rest. The dorsal side has a black midline flanked by two lighter bands.