Complex Invertebrates Arthropods and Echinoderms

15-3 Arthropods Arthropods More than a million have been identified Main competition for food Insects, Crustaceans, spiders, and scorpions

15-3 Arthropods 3 Main Characteristics Exoskeleton Rigid covering Does not grow Must be shed (molting)

15-3 Arthropods 3 Main Characteristics Segmented body Jointed appendages

15-3 Arthropods Open Circulatory system Reproduce sexually Blood is not contained in tubes From heart through open spaces in body Blood carried food but not oxygen Reproduce sexually Stay males and females

15-3 Arthropods Crustaceans Crabs Lobsters Barnacles Shrimp

15-3 Arthropods Crustaceans Body divided into segments A pair of appendages is attached to each segment Claws, legs, or antennae Can regenerate certain body parts

15-3 Arthropods Crustaceans Most live in watery environments Breath through gills

15-3 Arthropods Centipedes Have one pair of legs in each segment of their body Have claws that inject venom Carnivores Live in moist environments

15-3 Arthropods Millipedes Have 2 pairs of legs for each segment of their body Herbivores Roll up in ball when in danger Live under logs and rocks

15-3 Arthropods Arachnids Body divided into 2 parts 4 pairs of legs Head and abdomen 4 pairs of legs Are attached to their head

15-3 Arthropods Spiders Feed on insects or small vertebrates Webs Made of silk Secreted by structures in abdomen Most are remade every day

15-3 Arthropods Funnel Web

15-3 Arthropods Trapdoor Web

15-3 Arthropods Spiders Injects venom in prey through fangs Either kills or paralyzes prey Preserves living creatures

15-3 Arthropods Spiders Have book lungs Has several sheets of tissue As oxygen passes over sheets it is removed

15-3 Arthropods Scorpions Have large stingers Hold prey with claws Live under rocks and logs Nocturnal

15-3 Arthropods Ticks and Mites Live on other organisms Live off body fluids Juices of plants Blood of animals

15-3 Arthropods Insect Structure 3 Parts Head Chest (Thorax) Abdomen Has 3 pairs of legs attached to the chest

15-3 Arthropods Insect Structure Many eyes Compound eyes Simple eyes Contain many lenses Detect movement Simple eyes Detect light and dark

15-3 Arthropods Insect Structure Most have wings Can have many pairs Has series of tubes for carrying oxygen Reproduce sexually

15-3 Arthropods Growth and Development Grow rapidly Metamorphosis Must shed exoskeleton Metamorphosis When an insect changes their appearance during development

15-3 Arthropods Metamorphosis Complete 4 stage process Egg Larva Spends most of the time eating Pupa Usually covered in cocoon or chrysalis Adult

15-3 Arthropods Metamorphosis Incomplete Egg Young Adult Nymphs Looks like adult but doesn’t have all characteristics Adult

15-3 Arthropods Insect Behavior Most live solitary lives Do not directly compete for available food Males must attract females Buzzing Colors/lights Pheromones Chemicals that attract opposite sex

5-3 Arthropods Insect Behavior Social insects Can not survive on their own Form colonies or hives Individuals perform specific jobs

15-3 Arthropods Defense Mechanisms Mimics Weapons Look like surroundings Look like a predator Weapons Stingers Bite Venom

15-3 Arthropods Syrphid Fly

15-3 Arthropods Walking Stick

15-3 Arthropods Viceroy Butterfly

15-3 Arthropods Owl Butterfly

11-3 Echinoderms: The “Spiny-Skinned” Animals Internal skeleton Bone like plates Made of calcium 5 part body

11-3 Echinoderms: The “Spiny-Skinned” Animals Water vascular system Fluid-filled internal tubes that… carry food and oxygen Remove waste Help with movement

11-3 Echinoderms: The “Spiny-Skinned” Animals Tube feet Suction-cuplike Use to walk Use to open shells and catch food

11-3 Echinoderms: The “Spiny-Skinned” Animals Starfish Have 5 or more arms extending from a central body Have hundreds of tube feet Used to open clams Regenerate

11-3 Echinoderms: The “Spiny-Skinned” Animals Sea Lilies

11-3 Echinoderms: The “Spiny-Skinned” Animals Feather Star

11-3 Echinoderms: The “Spiny-Skinned” Animals Sea Cucumber

11-3 Echinoderms: The “Spiny-Skinned” Animals Sea Urchins

11-3 Echinoderms: The “Spiny-Skinned” Animals Sand Dollar

11-3 Echinoderms: The “Spiny-Skinned” Animals