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Arthropoda Tavia Sin and Kelly Chen The most successful of all animal phyla

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1 Arthropoda Tavia Sin and Kelly Chen The most successful of all animal phyla

2 Arthropoda Cheliceroforms-mostly terrestrial or marine; have chelicerae Myriapods-terrestrial; have antennae and legs Hexapods-mostly terrestrial; have antennae, legs (and sometimes wings), and segmented body Crustaceans-mostly marine and freshwater; have antennae, legs, and segmented body Kelly Chen

3 Sample Animals Cheliceriforms-sea spiders, horseshoe crabs, scorpions, ticks, mites, spiders Myriapods-centipedes, millipedes Hexapods-insects and their wingless, six-legged relatives Crustaceans-crabs, lobsters, shrimps, barnacles, and many others Chen

4 Body Cavity (coelom) Coelom does exist but is not the main body cavity Hemocoel-made up of the body sinuses, which are spaces surrounding the tissues and organs Coelom that forms in embryo becomes reduced Kelly Chen

5 Body Symmetry Bilateral symmetry Chen

6 Nervous System Well-developed, mesodermal, ventral, solid nerve cord Ventral-Pertaining to the front or anterior of any structure Chen

7 Circulatory System Open circulatory system Fluid called hemolymph is propelled by a heart through short arteries into sinuses Hemolymph reenters the heart through pores equipped with valves Kelly Chen

8 Digestive System Appendages are adapted to form mouthparts Spiders use chelicerae to chew prey while spilling digestive juices on it Myriapods and insects use jaw-like mandibles to eat Exhibit almost every feeding mode: carnivores, herbivores, detritus feeders, filter feeders, and parasites Kelly Chen

9 Excretory System Green glands (crustaceans)- collect residue from the blood and body; connected to excretory pores under antennae. Mapighian tubules (insects)- gather wastes from blood to release into intestine by excretory ducts. Coxal glands (arachnids)-located in cephalothorax near limbs; participate in excretion. Tavia Sin

10 Locomotion/Musculature Insects fly to escape predators, find food and mates, and move to new habitats. Most have one or two pairs of wings emerging from dorsal side of thorax. Wings are extensions of the exoskeleton so leg use is not affected. Sin

11 Skeletal Type Exoskeleton -external skeleton constructed from layers of protein and polysaccharide chitin. Molting (Ecdysis) –an arthropod sheds its exoskeleton and produces a larger one to grow in. Sin

12 Sensory Structure/Features Well-developed sensory organs, including eyes, olfactory(smell) receptors, and antennae that function in both touch and smell. Most are concentrated at the anterior end of the animal. Cheliceriforms lack antennae phy/enlarge/callicore-neglecta-butterfly-sartore.html Tavia Sin

13 Reproduction Incomplete metamorphosis- young (nymphs) resemble adults but are smaller, have different proportions, and have no wings. Complete metamorphosis- larval stage (eating, growing), middle stage (pupal), adult stage (dispersal, reproduction) Reproduction is usually sexual, with separate male and female individuals. xplorations/bug/libraryarticle.asp?ItemI D=126&SubjectID=145&categoryID=4 Tavia Sin

14 Gas Exchange Gills with thin, feathery extensions- increase surface area in contact with surrounding water. Tracheal systems- branched air ducts leading into interior from pores in exoskeleton. Book lungs- stacked plates contained internally; increase surface area, enhance exchange of O 2 and CO 2. Tavia Sin http://bio1151b.nicerweb. net/Locked/media/ch33/

15 Other Unique Features Largely related to segmentation, hard exoskeleton, and jointed appendages Arthropod means jointed feet As they evolved, the segments tended to fuse and become fewer in number and the appendages became specialized for a variety of functions Tavia Sin

16 Quiz Question #1 What skeletal type do arthropods have?

17 Answer #1 Exoskeleton

18 Quiz Question #2 true or false: Arthropods reproduce asexually

19 Answer #2 False

20 Quiz Question #3 What sensory organ functions in both touch and smell in most arthropods? a) eyes b) olfactory receptors c) antennae d) arms

21 Answer #3 C) Antennae

22 Quiz Question #4 The process of shedding the exoskeleton is called______

23 Answer #4 Molting, ecdysis

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