Wirrn

The Wirrn (Pronounced Wir-rin) are a race of human-sized insects native to the Andromeda Galaxy who appear in the third episode of Season 14.5.

They have two large golden eyes on their heads, long antennae and three silver mandibles. Under the head are two larger mandibles which they use to speak. They normally communicate by squeaking, though certain Wirrn are able to speak human languages. They also have six long arms which they can use as hands even though they are quite thin. They also have the ability to convert carbon dioxide back into oxygen.

The Wirrn are a very tough species, being able to survive numerous energy blasts and even diamond tipped blades. However, they are very susceptible to electricity.

Life Cycle
The Wirrn's breeding begins with a Queen looking for a suitable host to lay her egg into. The Wirrn normally use cattle-like creatures in the Andromeda Galaxy, but they can also use humans as their hosts. The larva gains all the racial memories of the Wirrn as well as the host's knowledge. Eventually, the larva eats the host and leaves.

These larvae are green slug-like creatures with several small limbs. Even though they're not as tough as adult Wirrn, the larvae are still tough enough to withstand huge amounts of damage. The larvae can also produce green slime which infects other creatures, turning them into larvae as well. The infected creatures gain all the Wirrn's knowledge and the previous host's knowledge as well.

Once the larvae undergo metamorphosis, they create large pupae, from which fully-grown Wirrn emerge to do the bidding of the swarm.