Sentient non-humans "hired" by Nanotrasen to fill in gaps in their Human workforce. Mothfolk are barred from serving command roles on Nanotrasen stations and are not protected by Asimov's laws of robotics.
Gameplay
Mothfolk are a optional playable race. You can make a mothperson character in the character panel, and change aspects of its appearance such as "skin" color.
Moths attack with their claws to slash and hack people, though this does not deal any additional damage. They are shown to "flutter" when speaking and have unique names (usually joke names that revolve around being a moth).
For gameplay purposes, moths can flutter around in pressurized low-gravity environments (aka the grav gen dies). However, they get crushed by electric damage, fly swatters and pest spray. Their wings easily burn off too.
Note that as a moth, the AI does not consider you human and is not obligated to listen to you. Also, certain crew members will show you depths of racism previously reserved for the clown. Centcom also maintains a strict "Human-Only" policy for Command Staff appointments. Fortunately for you, mothfolk are one of the races less likely to be discriminated against by other players. Relax and work on assembling cyborgs while assistants harass the lizardman janitor.