Nack wasn't lying about one thing...
Hmmm, I wonder if the pirates are like crustasians or insects...
votes on a combanation of the two
eat one, then you'll find out.
Of course it could be elbirate armour and they look nothing like that. They could be small mass's of flesh like what you find inside a Dalek.
crustasians and insects are both arthropods, as are arachnids so it would be easier to say that space pirates are a kind of semi-humanoid arthropod. I have seen descriptions that space pirates are quasi-insectoids, and in my opinion they're somewhat similar to scorpions or praying mantids in appearance
Wait a minute did that thing just scream Kraa That may not have been a battle cry Samus watch out!