Hecaton Tunic Creature Guide and Details | Subnautica 2

Found on the underside of structures.

Hecaton tunic. Named for the hundred-handed hecatoncheires of Greek Myth. A complex of animals undergoing competitive sex differentiation.

[1] Anatomy
Each pore on the surface of the hecaton is the mouth of a tunic, a complex filter-feeding animal. The colony's branching sturcture allows each tunicate access to the water so it can breathe and eat. Each tunic grows a flexible, semi-hard polyvinyl shell which merges with the neighbors' tunics, defending the entire colony.

[2] Growth patterns
Analysis suggests the colony begins as a single stem of identical tunicates cloned from an embryo. More successful tunicates become large and sexually mature, starting their new arms of the colony and developing their own eggs. Less successful tunicates are driven to the ends of the arms, where they shrink and develop a teal bioluminescence.

[3] Viral reproduction
The less successful tunicates do not release sperm. Instead, they are heavily infected by a strain of large RNA virus in the seawater. The majority of the tunic's genome consists of copies of this virus insert by retroviral action. How the hecaton tunic fertilizes eggs is therefore unclear - it seems to lack sperm cells.

Assessment: reproductive enigma. Await further updates.

They cannot be harvested.