Brachypelma vagans in Latin is all you need to say - whatever language follows is just packaging. I don't understand Lithuanian, but if your Red-rump is anything like mine (and I am referring to our tarantulas ... ), your translation is probably something like "I just invited the DEVIL himself into my house, and now I fear not only for my life, but for my very soul !!!!"
Dites bonjour a Diablo, le B. vagans le plus malin du monde!!! (That's as close as I'm ever likely to get to Lithuanian!)
Congratulations on your satanic acquisition, by the way!