The amoeba like people of Amtor
The race appears to be human but they are most certainly are not. Each member of the race has a red line running down the center of their bodies, the two halves of their bodies are slightly less symmetrical than a true human, not enough to make them look unattractive though. The races method of reproduction is to split down this line into two halves.
Sometimes (although rarely) one of the halves will fail to develop properly and will be incapable of reproducing!