The Arthropods Class Insecta
Characteristics of Class Insecta
Characteristics three pairs of walking legs wings usually present membranous thing, transparent, criss-crossed with supporting veins flying wings scale-covered butterflies and moths scales rub off easily leatherlike grasshoppers protect flying wings horny beetles thick shields
Characteristics three body segments one pair of sensory antennae head thorax abdomen one pair of sensory antennae
Life Processes of insects BJU PressArt, biology textbook, pp. 369
Life Processes: Insects movement three pairs of jointed legs wings most have two pairs of chitinous wings some one pair some wingless only invertebrates that can fly
Life Processes: Insects nutrition ingestion variety of mouth parts piercing siphoning sponging chewing
Life Processes: Insects nutrition digestion foregut midgut hindgut esophagus gastric cecum crop intestine gizzard stomach rectum anus
Life Processes: Insects respiration tracheae spiracles highly efficient – oxygen is transported without using the circulatory system circulation open circulatory system tubular heart excretion Malpighian tubules extract nitrogenous wastes and pour them into the intestine
Life Processes: Insects response anterior “brain” multiple sensory receptors pheromones – a chemical released by one animal that influences the behavior of another animal of the same species
Life Processes: Insects reproduction separate sexes testes/ovaries seminal receptacle ovipositor
More Insect Classes Chilopoda – centipedes Diplopoda - millipedes
Insect Metamorphosis
Incomplete Metamorphosis egg case adult adult egg case nymph (naiad)
Complete Metamorphosis (90%) eggs adult larva pupa
Major Insect Orders chart on page 385 Orthoptera Odonata Coleoptera Lepidoptera Hymenoptera Diptera –ptera = “wing”
grasshoppers, locust, crickets, cockroaches Order Orthoptera “straight wing” grasshoppers, locust, crickets, cockroaches
dragonflies, damselflies Order Odonata “toothed” dragonflies, damselflies
Order Coleoptera “sheath wing” beetles
Order Lepidoptera “scale wing” butterflies, moths
Order Hymenoptera “membranous wing” bees, wasps, ants
Order Diptera “two wings” mosquitoes, gnats, common housefly
Control of insects facet page 388 quarantine insecticides environmental changes biological controls
The excretory system of the grasshopper consists of green glands. nephridia. kidneys. Malpighian tubules.
What organ allows a female insect to deposit her eggs? ovipositor nephridia seminal receptacle tympanum
Give the organ where an insect perceives each of the following sensations. smell taste touch vision hearing antennae receptors on mouthparts tactile hairs compound/simple eyes tympanum
Insects are capable of both asexual and sexual reproduction. true false