Practice question

Onychophora represent small relictual terrestrial phylum bridging Annelida and Arthropoda, commonly called velvet worms due to remarkably soft velvety cuticle covered with transverse annuli and sensory papillae giving velveteen appearance, plus multiple pairs of unjointed fleshy lobopod legs tipped with claws. Nocturnal predators capturing insects by ejecting sticky slime from oral papillae hardening into net. Possess annelid-like segmental nephridia with cilia and peristalsis, but arthropod-like open haemocoel, dorsal heart with ostia, tracheal system. Restricted to humid tropical leaf litter, considered living fossil exemplifying arthropod origins and panarthropod evolution among ecdysozoans.