The In'hhui'lasendt were giant water dwelling animals that once lived in the Apnex Sea on the planet Romulus. When the Vulcans-in-Exile landed on Romulus, the First Rihannsu hunted these leviathans for their glandular secretions which served as a cheap source of power. By the mid-22nd century, the creatures had been extinct for millennia as a result of the actions fo the early Romulans. (ENT novel: Beneath the Raptor's Wing)