Pentapycnon

Pentapycnon is a genus of sea spiders (class Pycnogonida) in the family Pycnogonidae. As the name of this genus suggests, Pentapycnon is among the four genera of sea spiders with five pairs of legs in adults rather than the usual four leg pairs. This genus includes three species: P. bouvieri, P. charcoti, and P. geayi. The species P. bouvieri and P. charcoti are found in the Southern Ocean, whereas the species P. geayi is found in the Caribbean Sea, the tropical Atlantic Ocean, and the Mediterranean Sea. The species P. geayi is one of only two species of polymerous (i.e., extra-legged) sea spiders found outside the Southern Ocean.