No alien species counts as an animal taxinomically. A similar extraterrestrial ecosystem would likely result in reclassifications to add planet of greatest ancestral origin. Life seeders would make taxonomy even harder.

Exactly.

I'd argue centaur world is its own tree of life until proof exists that earth life and centaur world life had a common ancestor.

sigh Okay scientist, you can look at my dragon dick

... For science

"Wait, what's the mould for?"