Sexanymphon

Sexanymphon is a monotypic genus of sea spider (class Pycnogonida) in the family Nymphonidae. The only species in this genus is Sexanymphon mirabilis. As the name of this genus implies, sea spiders in this genus feature six pairs of legs in adults instead of the usual four leg pairs. The species S. mirabilis is notable as one of only two species of sea spiders with six leg pairs. This species is found in the Southern Ocean.