re: Thank you all.
Sorry to be late to this one, MA)
Depending on your language, earthworms are earthworms and first generation whatever's on Luna/moon, Mars, et al... would be just that: moonworms, marsworms, etc. Same would go for vegetation. In the latter, you could say or do a play on the genus words...
As for unearthing things, I think that dirt is dirt and or/earth is earth anywhere you go. I'm sure any language will have fun with that one.
I'm with Frank in that when an English speaker refers to the planet Earth with a capital 'E'.