Where does “Ophiura” come from?

Ophiura (Translingual) comes from New Latin ophiurus, from Ancient Greek οὐρά, from Proto-Indo-European ors- — tail.

Ancestry of “Ophiura”, step by step

Step	Language	Word	Meaning
1	New Latin	ophiurus	brittle star
2	Ancient Greek	οὐρά	the tail, of a lion, dog etc; the rear-guard,...
3	Proto-Indo-European	ors-	tail