Was heißt »Abart« auf Englisch?

Das Substantiv Abart lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Synonyme

Colloquial language is not necessarily a grammatical and stylistic questionable form of expression. There is no doubt a cultivated variety of it which I really find to my liking.
Many shark species are threatened with extinction.
Esperanto is already a good language for the mere fact that it can distinguish between Man as an individual of humankind, and Man as the male of the species.
This species is critically endangered.
This species of butterfly has already gone extinct.
Not all species of spiders are poisonous.
Once a species goes extinct, it's gone forever.
The crocodile is a protected species.
I had never before seen this species of fish.
There are many endangered species.
We study a species of poisonous frog very similar to a stone.
Many animal species are on the brink of extinction.
This is a plant of the species Schlumbergera truncata.
Ancient cultures had a variety of explanations for what the stars and planets were, but nearly all of them believed in the possibility of life forms much different from those they saw on Earth.
Elephants are an endangered species.
It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change.
Cabbage, cauliflower, broccoli, and Brussels sprouts are all cultivars of the same species.
Easter bunnies are an oviparous species in the mammal family of Leporidae.
It is an endangered species.
This species of deer is so elusive that only two have ever been photographed in the wild.