The lobopod Onychodictyon from the Lower Cambrian

Onychodictyon ferox, from the Lower Cambrian Chengjiang Lagerstätte, is a worm−like armored lobopod with 10 pairs of dorsal plates and a pair of probable sensory appendages (“antennae”). Newly discovered complete specimens show that Onychodictyon is represented by two species: O. ferox with a “head ” bearing a pair of dorsal “antennae ” and a trunk with 11 pairs of limbs, whereas O. gracilis has a blunt anterior end without any appendages and a trunk with 12 pairs of limbs. Because of the close resemblance of the “antennae ” of O. ferox and those of the lobopod Miraluolishania, they are consid− ered to be homologous structures. The “antennae ” of Cambrian lobopodians are proposed to be homologous with the ar− thropod antennulae