Tythonian

The Tythonians were a species of aliens from Tythonus, notable for their huge size and longevity of life.

Biology
The Tythonians were massive, blob-like organisms, sometimes hundreds of feet long. They were glowing green in colour and had an outer membrane that was deeply creased in places. They had no true limbs, but did have two large pseudopods. One pseudopod was shaped like the letter Y, while the other was simply a large tube. They also had no vocal cords and needed to communicate with the aid of Tythonian Communicators. Tythonians could live for 40,000 years.

Tythonians subsisted on chlorophyll and mineral salts, which they could absorb through their skin. Their mineral rich diet allowed them to weave a special, extremely tough material from their tube-like pseudopods. This material was self-regenerating and could fill a variety of functions. (DW: The Creature from the Pit)



Technology
Tythonian technology was usually based off the materials that they can naturally weave. Erato travelled in a massive egg-like craft of this material, with a photon drive made of other metals. Tythonians could also control the paths of neutron stars, which they use in times of war. The Tythonians also made use of Tythonian Communicators to speak with other species. (DW: The Creature from the Pit)


 * Tythonians seemed to have limited dexterity, which would have made the construction of the communicators difficult. Possibly, the communicators were made by another species to facilitate interactions.

History
At some point in history, the planet Tythonus was running out of chlorophyll for food. The Tythonians discovered that Chloris was rich in plant life and could use the metals of Tythonus. The Tythonians sent Erato to try to set up a trade agreement, but he was captured by Lady Adrasta and was trapped in a mine for 15 years.

Erato was eventually saved by the Doctor, but the distress signal of his spaceship was picked up by the Tythonians, who launched a neutron star at its sun. With the help of Erato, the Doctor was able to save Chloris and set up a trade agreement. (DW: The Creature from the Pit)