Insects Flashcards
3 segments of the thorax
First - prothorax
Second - mesothorax
Third - metathorax
The 5 basic components of the mouthparts
1) labrum 2) hypopharnyx 3) mandibles 4) maxillae 5) labium
Six segments of legs from proximal to distal
Coxa, trochanter, femur, tibia, tarsus and pretarsus
Describe the tarsomeres on an insect leg
Pseudosegments on tarsus - not real segments as there is only one tarsal muscle.
Five of fewer.
Underside may have ventral pads (pulvilli or euplantulae) which assists in adhesion to surfaces. Can be setose (hairy) or smooth.
Describe the pretarsus on an insect leg
Bears small pair of lateral claws (ungues) and usually a median lobe (arolium).
In Diptera there may be a central spine like or pad like empodium and a pair of lateral pulvilli. These structures allow flies to walk on walls and ceilings.
Sensory functions of the insect antenna.
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Order of insects with ocelli
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What is the function of a trichogen cell?
T
Which gland secretes ecdysone?
Protharic gland
Where are juvenile hormones secreted from?
Corpus allatum
Name one genus or species of insect that shows viviparity
Viviparous=gives birth to live young
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What is the insect penis called?
Aedeagus
Holometabolous vs hemimetabolous development
Hemi:
Incomplete metamorphosis - do not have pupa
Juveniles = nymphs
Resemble adults without wings and genetalia
Nymphs often coexist with adult in similar environment and eat same food
Holo:
Complete metamorphosis - have pupal stage
Juveniles = larvae
Look different from final adult in every instar
Different lifestyle and diet from adult - competition between larvae and adult rare
What is the central body cavity of insects called?
Haemocoel
What do anautogenous insects need in order to mature their eggs that autogenous insects do not?
Anautogenous insects need to feed before eggs can mature
