BNS-1002 insects :3 Flashcards
outline the hexapod body plan
head
thorax
abdomen
how many segments are the head thorax and abdomen made of in hexapods
5 segments head
3 segments thorax
11 segments abdomen
Describe the anatomy of orthopera
relatively primitive
unspecialised insects
Describe insect wings
Thin cuticular membranes
criss crossed with veins containing haemolymph
What is a unique feature of beetle wings
the forewings are protective-elytra
Describe dipteran wings
hindwings are reduced to balance organs-halteres
What does the wing hinge contain
The wing hinge contains resilin
How do wings in primitive insects upbeat
direct flight muscles contract
lower wings
indirect flight muscles contract
notum depressed
what does the diversity of insect mouthparts reflect
The diversity of mouthparts reflects tremendous diet range
what diet is a piercing mouthpart used for
A blood diet
what diet is a sucking mouthpart used for
a nectar feeding diet
what diet is a sponging mouth part used for
a solid dissolution diet
what is the function of malpighian tubes
conservation of water
excretion of excess ions, plant toxins, uric acid
conservation of organic solutes
describe the insect nervous system
paired ventral nerve cord
segmental ganglia
nerves tripartite
cerebral ganglia
Describe insects compound eyes
made from ommatidia
each unit contains sensory neurones
each retinular cell surrounded by 12-18 secondary pigment cells
