Spinthra is an enemy that appears in Super Mario RPG: Legend of the Seven Stars. Spinthras are large, spider-like enemies that can be found in Land's End and Bean Valley. They are stronger versions of Arachnes.
Spinthras mainly attack by biting a single member of Mario's party. However, their main technique is to use the move Poison in order to poison a party member. They can also bite someone turning them into a scarecrow.