Arcadian
- Appearance: Mammalian
- Broad heads (Star Trek IV: The Voyage Home)
- Two stripes of hair sweeping back over the top of the skull (Star Trek IV: The Voyage Home)
- Subtle noses; large ears; wide-set, brightly colored eyes (Star Trek IV: The Voyage Home)
- Tail (TOS Novel: Ex Machina)
- Broad heads (Star Trek IV: The Voyage Home)