Several species share the specific name poseidon, the species descriptor in a binomial name.

These include:

Flax poseidon (F. poseidon), a moth Hypaeus poseidon (H. poseidon), a spider Lepidochrysops poseidon (L. poseidon), a butterfly Polyommatus poseidon (P. poseidon), a butterfly Thyropygus poseidon (T. poseidon), a millipede

See also Poseidon (disambiguation)