| 1 |
Insect has wings? |
Go to 2 |
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Insect wingless or with
poorly developed wings
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Go to 29
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| 2 |
One pair of wings |
Go to 3 |
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Two pairs of wings
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Go to 7
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| 3 |
Body
grasshopper-like, with enlarged hind legs and pronotum extending back over
abdomen |
Orthoptera |
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Insects not like this
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Go to 4
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| 4 |
Abdomen with 'tails' |
Go to 5 |
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Abdomen without 'tails'
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Go to 6
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| 5 |
Insects <5mm
long, with relatively lonbg antennae: wing with only one forked vein
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Hemiptera |
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Larger insects with short antennae and
many wing veins: tails long
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Ephemeroptera
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| 6 |
Forewings forming club-shaped halteres
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Strepsiptera |
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Hind wings forming halteres (may be
hidden)
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Diptera |
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| 7 |
Forewings hard or leathery
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Go to 8
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All wings membranous
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Go to 13
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| 8 |
Forewings horny apart from
membranous tip |
Hemiptera |
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Forewings of uniform texture throughout
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Go to 9
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| 9 |
Forewings
(elytra) hard and veinless, meeting in centre line |
Go to 10 |
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Forewings with many veins, overlapping at
least a little and often held roofwise over the body
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Go to 11
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| 10 |
Abdomen ending in a pair of
forceps : elytra always short |
Dermaptera
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Abdomen without forceps: elytra commonly
cover whole abdomen
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Coleoptera
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| 11 |
Insects with peircing and sucking beaks
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Hemiptera |
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Insects with chewing mouthparts: cerci
('tails') usually present
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Go to 12
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| 12 |
Hind legs modified for jumping
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Orthoptera |
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Hind legs not modified for jumping
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Dictyoptera
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| 13 |
Tiny insects covered with white powder
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Go to 14 |
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Insects not like this
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Go to 15
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| 14 |
Wings held flat at rest:
mouth-parts adapted for piercing and sucking |
Hemiptera |
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Wings held roofwise over
body at rest: biting mouthparts |
Neuroptera
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| 15 |
Small, slender insects with narrow,
hair-fringed wings: often found in flowers |
Thysanoptera
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Insects not like this
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Go to 16
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| 16 |
Head extending downwards into a beak
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Mecoptera |
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No such beak
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Go to 17
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| 17 |
Wings more or less covered
scales: coiled proboscis (tongue) usually present |
Lepidoptera
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Wings usually transparent
although often hairy
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Go to 18
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| 18 |
Wings with a network of
veins, including many cross veins |
Go to 19
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Wings with relatively few cross veins
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Go to 23
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| 19 |
Abdomen with long terminal threads
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Go to 20 |
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Terminal appendages short or absent
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Go to 21
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| 20 |
Forewings much larger than
hind wings: wings held vertically over body at rest: 2 or 3 terminal threads
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Ephemeroptera
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Wings more of less equal in
size or hind wings larger: wings folded close to body at rest: 2 terminal
appendages
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Plecoptera
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| 21 |
Antennae very short: body at least 25mm
long |
Odonata |
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Antennae longer: greater than width of
head
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Go to 22
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| 22 |
Tarsi 3-segmented
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Plecoptera
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Tarsi 5-segmented
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Neuroptera
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| 23 |
Wings noticeably hairy |
Go to 24 |
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Wings not noticeably hairy
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Go to 25
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| 24 |
All of wings more or less
alike: front tarsi swollen |
Embioptera
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Hind wings usually broader
than forewings: front tarsi not swollen
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Trichoptera
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| 25 |
Tarsi with 4 or 5 segments
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Go to 26
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Tarsi with 1 - 3 segments
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Go to 27
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| 26 |
All wings alike |
Isoptera |
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Hind wings much smaller than forewings
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Hymenoptera
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| 27 |
Hind wings similar to or
larger than forewings: abdomen with cerci |
Plecoptera
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Hindwings smaller than
forewings: no cerci
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Go to 28
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| 28 |
Tiny insects with at least 12 antennal
segments |
Psocoptera
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Never more than 10 antennal
segments: piercing and sucking beak present
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Hemiptera |
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| 29 |
Insects with slender, twig like body
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Phasmida |
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Insects not like this
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Go to 30
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| 30 |
Insects with
grasshopper-like body and long back legs |
Orthoptera
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Insects not like this
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Go to 31
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| 31 |
Small, soft-bodied insects
living on plants, often under protective sheild or scale |
Hemiptera |
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Insects not like this
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Go to 32
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| 32 |
Minute soil-living insects,
<2mm long without antennae |
Protura |
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Insects not like this
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Go to 33
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| 33 |
Insects with cerci or other
abdominal appendages |
Go to 34
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Insects with other appendages
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Go to 41
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| 34 |
Abdominal appendages long
and conspicious |
Go to 35
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Abdominal appendages short
or hidden under body
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Go to 38
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| 35 |
Abdominal appendages forming pincers
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Go to 36 |
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Abdominal appendages not
forming pincers
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Go to 37
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| 36 |
Tarsi 3-segmented
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Dermaptera
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Tarsi 1-segmented
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Diplura |
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| 37 |
Abdomen with 3 long terminal
appendages |
Thysanura |
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Abdomen with only 2 terminal appendages
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Diplura |
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| 38 |
Tiny jumping insects, head
points downwards forming a beak |
Mecoptera |
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No sign of beak
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Go to 39
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| 39 |
Small or minute insects with
a forked springin organ under rear of abdomen: generally found in soilor
decaying vegetation |
Collembola
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Insects not like this
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Go to 40
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| 40 |
Tarsi usually 4-segmented |
Isoptera |
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Tarsi 3-segmented: front
tarsi swollen
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Embioptera
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| 41 |
Parasites in fur or
feathers: insects generally flattened side-to-side or dorso-ventrally
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Go to 42
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Insects not parasitic and
not usually flattened
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Go to 46
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| 42 |
Jumping insects flattened from
side-to-side |
Siphonaptera
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Insects flattened
dorso-latterally
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Go to 43
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| 43 |
Insects of moderate size:
head partly withdrawn into thorax |
Go to 44
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Small minute insects: head
not withdrawn into thorax
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Go to 45
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| 44 |
Antennae very short: very
'leggy' insectswith strong claws well suited to clinging to a host mammal
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Diptera |
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Antennae long: body somewhat
circular, with less prominant legs and claws
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Hemiptera |
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| 45 |
Prothorax distinct: biting
mouths |
Mallophaga
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Thoracic segments fused into one unit:
sucking mouths
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Anoplura |
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| 46 |
Abdomen with pronounced
'waist': antennae often elbowed |
Hymenoptera
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No such features
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Go to 47
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| 47 |
Body >5mm long, clothed with
flattened hairs and scales: vestigial wings present |
Lepidoptera
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Body usually <5mm long, bald
or occasionally scaly: vestigial wings rarely present
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Go to 48
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| 48 |
Head a wide or nearly as
wide as body: biting mouthparts: insects often found among dried materials
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Psocoptera
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Head narrower than body:
sucking mouthparts: abdomen often with a pair of tubular outgrowths near
hind end: insects found on growing plants
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Hemiptera |