# |
QUESTION |
GO TO # |
ORDER |
| 1 | Wings usually present Wings absent |
2 17 |
--- --- |
| 2 | Mouth parts formed for biting Mouth parts formed for sucking |
3 13 |
--- --- |
| 3 | Tip of abdomen with paired,
forceps-like appendages (earwigs) Tip of abdomen without paired, forceps-like appendages |
--- 4 |
DERMAPTERA --- |
| 4 | Forewings membranous or leathery, not
horny in texture Forewings horny, shield-like, forming cover for hindwings (beetles) |
5 --- |
--- COLEOPTERA |
| 5 | Forewings leathery, hindwings folded
fanlike (grasshoppers, crickets, cockroaches) Forewings membranous, hindwings not folded fanlike |
--- 6 |
ORTHOPTERA --- |
| 6 | Abdomen usually constricted at base,
often with a stinger or specialized ovipositor (ants,
bees, wasps) Abdomen not constricted at base, without a stinger or specialized ovipositor |
--- 7 |
HYMENOPTERA --- |
| 7 | Antennae short, inconspicuous Antennae long or conspicuous |
8 9 |
--- --- |
| 8 | Hindwings smaller than forewings;
abdomen with 2 or 3 threadlike filaments (mayflies) Hindwings not smaller than forewings, abdomen without long, threadlike filaments (dragonflies, damselflies) |
--- --- |
EPHEMERIDA ODONATA |
| 9 | Tarsi with less than 5 segments Tarsi 5-segmented |
10 11 |
|
| 10 | Hindwings broader than forewings, folded
in repose (stoneflies) Hindwings same width as forewings, not folded (termites) |
--- --- |
PLECOPTERA ISOPTERA |
| 11 | Wings naked or very slightly hairy Wings densely clothed with hair (caddisflies) |
12 --- |
--- TRICHOPTERA |
| 12 | Head prolonged into beak, with
mouthparts at tip (scorpionflies) Head not prolonged or beaklike (lacewings, ant-lions) |
--- --- |
MECOPTERA NEUROPTERA |
| 13 | Wings densely clothed with scales; mouth
parts coiled below head (butterflies, moths) Wings not clothed with scales; mouth parts not coiled below head |
--- 14 |
LEPIDOPTERA --- |
| 14 | Mouthparts sunken into head capsule,
asymmetrical; usually very tiny insects; wings with hair
fringe (thrips) Mouthparts external in repose, symmetrical |
--- 15 |
THYSANOPTERA --- |
| 15 | Wings usually 4; mouth parts forming a
jointed beak Wings 2; mouth parts stylet-like or sponge-like, not forming a jointed beak (flies) |
16 --- |
--- DIPTERA |
| 16 | Basal portion of forewings thickened,
leathery, or horny; distal portion membranous (true bugs)
Forewings with same consistency throughout (aphids, scale insects, leafhoppers, cicadas, psyllids) |
--- --- |
HEMIPTERA HOMOPTERA |
| 17 | Abdomen without conspicuous appendages Abdomen with conspicuous "tails" or "spring" |
18 19 |
--- --- |
| 18 | Body flattened dorsoventrally; prothorax
small, ringlike (lice) Body flattened laterally; prothorax large and hoodlike (fleas) |
--- --- |
ANOPLURA SIPHONAPTERA |
| 19 | Abdomen 10- or 1l-segmented, terminating
in forceps (pincers) or long filaments (silverfish,
bristletails) Abdomen with not more than 6 segments, often terminating in a springing apparatus (springtails) |
--- --- |
THYSANURA COLLEMBOLA |