Arthropods By: Ethan Jones and Xavier

Arthropods Makes up 3/4's of all animal species -total number of arthropod species is MORE than all other species combined Includes insects, spiders, & crustaceans Arthropod means "jointed foot" - all arthropods have jointed appendages Segmented body Exoskeleton for protection & support Exoskeleton is shed during molting Open circulatory system Compound eyes (has many individual units) Excretory structures called Malpighian tubules Wings in many groups Respiration using spiracles and trachae

Segmentation More obvious in larval forms, adults have fused segments -----> Head | Thorax | Abdomen Some have a fused head and thorax -- the cephalothorax Taxonomy----->

Subphylum Chelicerata spider Includes Class Arachnida) spiders, ticks, scorpions, mites and horseshoe crabs Have a cephalothorax (fused head and thorax) and abdomen No antenna Spinnerets in spiders make webs Have 6 pairs of jointed appendages: Chelicerae - claws or fangs (1 pair) - (spiders have venom) Pedipalps - used for feeding, sensing, transferring sperm (1 pair) Walking legs - movement (4 pairs)

Subphylum Crustacea Marine members include shrimp, lobster, barnacles, & crabs Terrestrial crustaceans called isopods (pillbugs or rollypollys) Freshwater members include crayfish and daphnia All have mandibles for chewing or tearing Have cephalothorax and abdomen Lobsters and large custraceans are called Decapods Barnacles are sessile (don't move) Have 10 pairs of jointed appendages Breathe through gills

Subphylum Uniramia - Insects and their Relatives Includes 3 classes --- Chilopoda (centipedes), Diplopoda (millipedes), & Insecta

Class Chilopoda Centipedes (predators) Name means "100 legs" Flattened body Have 1 pair of legs per body segment Pincers can inject venom

Class Diplopoda Millipedes Name means "1000 legs" Have 2 pairs of legs per body segment Rounded body Scavengers or herbivores

Class Insecta 3 pairs of legs 3 body parts - head, thorax, abdomen Wings in most All appendages attach to the thorax 9-11 segments in abdomen Mandibles for chewing

To wrap it all up! EES Sub Assignment All work is to be submitted to substitute at the end of class for a quiz grade. Glencoe Earth Science Text Book Chapter 14 Define vocabulary words on pages 359, 364, 369, and 375 in complete sentences. Read and summarize, in complete sentences, Chapter 14 with separate sections for 14.1, 14.2, 14.3, and Complete Section Assessments on pp. 363, 368, 374, and 377. Answer in complete sentences Complete Problem Solving Lab on p Answer questions in complete sentences. Read and Summarize in complete sentences, Global Warming on p Complete the procedure and challenge portion of Global Warming on p All answers must be in complete sentences. Complete the Chapter Assessment on pp Write questions and answers using complete sentences where applicable