Biology 3484A/B Lecture Notes - Lecture 11: Sclerotin, Onychophora, Arthropod
28 Jul 2017
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Has legs common name = velvet worms. External skeleton: entire outer surface of animal; some internal parts internal structures of exoskeleton: invaginations. Formed of chitin (structural polysaccharide) and proteins = strong and flexible: hard rigid plates connected by softer, flexible joints, sclerotin = structural protein, more sclerotin in harder plates, less sclerotin in flexible joints. ** the two lines right next to the middle are invaginations. Many millipedes are well defended (curl into a ball; paired glands that secrete toxins) Many arthropods are great source of food to vertebrates and invertebrates. Essential in marine food webs (eg. krill) 10 million tons consumed by humans each year. Synapomorphy: two body regions and two pairs antennae (must occur at same time) 5+ pair walking legs; additional legs modified for swimming. Chelicerata specialized mouthparts called chelicerae: primarily used in feedings; sometimes defense. Blue blood: hemocyanin (carries oxygen in their blood, contains copper that turns blood blue)
