2Arthropods Arthropoda - “jointed legs. Largest animal phylum; includes insects, spiders shrimp, and centipedes.Jointed appendages include, legs, antennae, claws, & pinchers.
3Body Cavity & digestive system; possess mouth & anus. Open circulatory system w/ a heartNervous system is similar to annelids, but with larger brainsHave compound eyes to detect color & motionHave featherlike gills, book gills or book lungs to respire
4Skeletal Structure Have an external structure called an exoskeleton. Made up a protein & a carbohydrate called chitin.Sheds its exoskeleton as it grows in a process called molting.Is vulnerable to predators while new exoskeleton hardens
5Class Insecta Insects are largest invertebrate class. Three body regions: head, thorax, & abdomen.Head contains a pair of antennae, eyes, & a mouth.
6Thorax has 3 pair of jointed legs, & 1 or 2 pair of wings in most species. Abdomen is divided into 11 segments (No wings or legs attached to abdomen).
7Only invertebrates capable of flight. - allows them to find food, home, and mates better and it allows them to escape predators.
8Possess both simple & compound eyes (detect color and movement). Antennae are used for touch & smell.Open circulatory system carries food and waste.O2 enters and CO2 exits through spiracles (holes) on the abdomen and thorax.
9Reproduction Reproduce sexually. Many undergo metamorphosis - series of changes controlledby hormones.Two types: Complete & Incomplete.
10Complete Metamorphosis Most insects such as: butterflies, beetles, ants, bees, moths & flies develop through complete Metamorphosis.4 stages: Egg, Larva, Pupa (resting), & Adult.
18Lost appendages can be regenerated. 4 others are walking legs. 5 pairs of swimmerets on abdomen help in locomotion & reproduction.Lost appendages can be regenerated.Telson is a muscular tail possessed by crayfish, shrimp & lobster.
19they force water over the gills for breathing. Possess compound eyes.One or two antennaeJaws called mandibles are used for crushing food.they force water over the gills for breathing.Important food source for humans.
20Arachnids Class containing spiders, scorpions, mites, & ticks. Possess cephalothorax & abdomen.4 pairs of legs, but lack antennae.
21Poison glands, stingers, or fangs are used to subdue prey. Some have a pair of modified appendages (pedipalps) used in feeding & prey capture.Pedipalp
22Respiration occurs through spiracles & book lungs.
23Spiders Poisonous bite paralyzes prey. Digestive enzymes then liquefy organs, which are drunk later.
48Millipedes Round bodies with 2 pairs of legs per body segment. Possibly over 100 segmentsFeed on dead & decaying plant matterRoll up in a ball when disturbed.Some can expel cyanide gas or unpleasant chemicals as a defense mechanism.