chapter 37: insects

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the insect world

characteristics of insects

distinctive body parts

compound eyes

mandible

wings

segmentation

metamorphosis -incomplete or complete (grasshoppers and butterflies)

entomology- the study of insects and other terrestrial arthropods

anatomy of a grasshopper

outer

antenna

thorax

compound eyes

abdoman

wings

spiracles

inner

digestive system- crop, gizzard, intestine, gastric ceca, mid gut, hind gut, labrum and labium, mandibles, maxilla, anus

respiratory and circulatory system- heart, aorta,tracheae, spiracles (open circulatory system)

excretory system

reproductive system-seminal re

nervous system-

incomplete metamorphosis

egg

nymph

adult

complete metamorphosis

egg

larvae

pupa

adult

Página 2

insect behavior

-insects use sound, light, color, and pheromones to communicate-

pheromone- a chemical released by an animal that affects behavior or development of other members of the same species through smell or taste

can help animals find their way back to a hive or a nest

can be used to attract mates

-sound communication-

attract mates

warn away others from territories

-light communication-

to find mates

species of fireflies have own pattern of flashes

-honey bee behavior-

social insects- insects that live in colonies

bees, wasps, ants, and termites

every member has a job to do

innate behavior- genetically determined behavior

behaviors that are neither taught or learned

types of individuals in a honeybee colony

worker bees- nonreproductive females that make up the majority of the hive

queen bee- the only reproductive female in the hive, only function is to reproduce

drones- males that develop from unfertilized eggs. deliver sperm to the queen. when the honey supply is low the worker bees kill the drones to clear the hive.

-worker bee-

feed the queen, drones, and larvae

nurse bees secrete

royal jelly- high protein substance to feed the queen and youngest larvae

after a week begin to produce wax to fix the hive and honey comb

altruistic behavior- sacrificing behavior that benefits another individual

kin selection- mechanism of increasing the frequency of one's genes in a population by helping increase the reproductive success of relatives