Mucurorm

Splitting from their ancestors, the mucurorm descended deeper into the southern oceans. Functionally, they occupy the same niche as their ancestors, filtering zooplankton as they go along the current. Negligibly larger than their ancestor, they have developed a viscous mucus that they secrete from their skin. The mucus is poisonous, containing a nerve toxin that paralyzes any potential predators. Their skin has also become less dense to handle the low depths, to the point that if they were to be brought to the surface their skin would leak.