Study of Scanning Electron Microscope images The relationship between the structure of insects and their mode of living Group A
What is an insect? Class: Invertebrates Phylum: Arthropods Three part body: head thorax abdomen Three pairs of joined legs, compound eyes and a pair of antenna Most diversed animals
Comparison of di ff erences in structure(legs, eyes and mouth) Asian Tiger Mosquito Aphid
Asian tiger mosquito • Order: Diptera • Blood sucking( female only) • Transmission of disease • Larvae in polluted water
Aphid • Family: Apidoidea • Sap-sucking • Live on leaves on trees and shrubs • Most destructive insects pests
Legs( magnified by 1.5k) (Asian tiger mosquito) • Hooked claws for clinging to skin • Hairy pads for sticking to smooth surface • Water repelling for standing on water surface
Legs(Magnified by 800) (Asian Tiger Mosquito) • Feathery scales for walking on water
Legs(Magnified by 1.2k) (Aphid) • Long and thin for penetrating the stem
Legs(manified by 6k) (Aphid) • Two-jointed , two-clawed tarsi for clinging on to the stem
Comparison of legs WATER FEATHERY CLAWS HAIRY PADS REPELLENC SHAPE SCALE E Facing the ASIAN Long and TIGER same Yes Yes Yes thin MOSQUITO direction Long and APHID C-shaped No No No thin
Mouth(magnified by 1k) (Asian tiger mosquito) • Elongated( in female) • Two sensory palps( shorter in male)
Mouth(Magnified by 1.5k) (Aphid) • Stylets enclosed in rostrum • Long and needle like
Comparison of mouth PRESENCE OF ENCLOSURE OF SHAPE PALPS ROSTRUM ASIAN TIGER Elongated Yes No MOSQUITO Long and needle No Yes APHID like
Eyes(magnified by 600) (Asian Tiger mosquito) • Compound eyes distinctly separated • Semi circular rows of ommatidia • Ability to detect fast movement
Eyes(magnified by 8k) (Asian tiger mosquito) • Hexagonal
Eyes(magnified by 2.5k) (Aphid) • Two compound eye • Circle in shape
Comparison of eye NUMBER OF SHAPE OF COMPOUND COMPOUND VIEW ANGLE EYES EYES ASIAN TIGER More Hexagonal Large MOSQUITO APHID Less Circular Large
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