- The marmoset (Hapale vulgaris)
- the most popular marmoset (Hapale vulgaris). Previously, the name has also been put on various other species of equivalent genus.
- a little squirrel-like monkey of south usa, some sort of marmoset, Hapale jacchus.
- [capitalized] A genus of marmosets: just like Hapale. In Addition Iacchus. See Mididæ.