Aphotic and Dark-skinned

Aphotic adjective - Lacking light; especially not reached by sunlight.

Dark-skinned and aphotic are semantically related. In some cases you can use "Dark-skinned" instead an adjective "Aphotic".

Dark-skinned adjective - Having skin rich in melanin pigments.

Aphotic and dark-skinned are semantically related. Sometimes you can use "Aphotic" instead an adjective phrase "Dark-skinned".