Metamorphosis

Define metamorphosis

‘relatively abrupt” change in body form and physiology between the immatures and adult stages

what kind of insects undergo metamorphosis

pterogotes

Hemimetabolous metamorphosis is

incomplete with gradual body form changes

hemimetabolous immatures

nymphs

resemble adult form with slightly different proportions

nymphs of hemimetabolous insects

Holometabolous metamorphosis

complete

development changes abruptly at pupal molt

holometabolous

determinate growth

certain number of molts and then growth ends at the adult stage

between molt forms are called

instars

exopterygotes (resembles ancestor form)

develop wings externally

hemimetabolous insects do not have a

pupal molt

Holometabolous immatures

larve

larve and adults do not share

ecology

larva do not resemble

adult forms of holometabolous

endopterygote

develop wings internally

ametabolous development

non-insect hexapods and apterygote insects

in ametabolous development the immatures and adults have the same

general body forms

ametabolous development uses what kind of growth

indeterminate/ no set number of molts

example of ametabolous developing insect

silverfish

function of juvenile hormone (JH)

supressent that determines body form/ outcome of molt

when there are high concentrations of JH in the body, maturation is

prevented

stimulation of molt in hemimetabolous insects is determined by

ecdysone

hemimetabolous insects have a more gradual decrese in ______ than holometabolous insects do

JH production

Holometabolous insects have a dramatice drop off in

JH production

in lots of holometabolous insects the __________ dissapear after reaching maturity

prothorasic glands

JH mimics

prevent molting into adulthood

Ecdysone receptor agonists

stimulate molt earlier resulting in deformed emergence

chitin synthesis inhibitor

prevent proper cuticle formation