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Dichotomous Keys - Text Format

Key to common families of Orthoptera (Grasshoppers & Crickets).

No. From Description Go to Name
1a The front femora are almost as long and thick as the hind femora 2
1b The hind femora are much longer and thicker than the front femora 3
2a 1a The front tibiae are modified into scoops for digging

Gryllotalpidae
(Mole Crickets)

2b 1a The front tibiae are enlarged, but not modified into scoops

Gryllacridadae
(Jerusalem Crickets)

3a 1b The pronotum extends to cover the abdomen

Tetrigidae
(Pygmy Grasshoppers)

3b 1b The pronotum does not cover the abdomen 4
4a 3b The body is 4-10 mm long; the end of the abdomen has two pairs of projections

Tridactylidae
(Pygmy Mole Crickets)

4b 3b The body is usually >10 mm long, the end of the abdomen has one pair of projections (cerci) 5
5a 4b The antennae are short (usually less than half as long as the body); auditory organs, when present, are on he sides of the first abdominal segment 6
5b 4b The antennae are long (usually at least as long as the body); auditory organs, when present, are on the front tibiae 7
6a 5a The antennae are shorter than the front femora; wings are missing Eumasticidae
Eumasticidae
(Monkey Grasshoppers)
6b 5a The antennae are longer than the front femora; wings are present Acrididae
Acrididae
(Short-horned Grasshoppers)
7a 5b The wings are missing; the body is humpbacked Gryllacridadae
Gryllacridadae
(Cave Crickets)
7b 5b The wings are present but sometimes small; the body is not usually humpbacked 8
8a 7a The ovipositor is shaped like a needle; the body is often brown

Gryllidae
(Crickets)

8b 7b The ovipositor is flattened like a sword; the body is usually green Tettigoniidae
Tettigoniidae
(Long-horned Grasshoppers, Katydids)


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