Maguanus was chief of the primitive Assisimians. He despised Lightsmith and formed an uneasy alliance with Brutus, but Brutus soon tired of him and killed him. Later, the rest of his tribe attacked the river settlement but ended up agreeing a truce and becoming friends.
- The Assisimians were distantly related to the Winged Monkey-Demons, according to Lightning Smith.
- Maguanus is exclusive to the continuity of the Planet of the Apes comic books published by Marvel Comics.
- Maguanus is exclusive to the continuity of the Marvel Comics Planet of the Apes mythos.