Other
- Aaptos aaptos — a sponge
- Acanthogyrus acanthogyrus — a parasitic worm in the quadrigyridae family
- Chaos chaos — an amoeba
- Cidaris cidaris — a sea urchin
- Loa loa — loa loa filaria
- Spirorbis spirorbis — an annelid
- Velella velella — by-the-wind-sailor
- Tubifex tubifex — sludge worm
Read more about this topic: List Of Tautonyms