Dichotomous Key/Hexapoda

Dichotomous Key
Hexapoda
Kingdom Animalia
Phylum Arthropoda
Subphylum Hexapoda

1

  • Wings
    • Present - 12
    • Not present - 2

2

  • Lifestyle
    • Parasitic - 3
    • Not parasitic - 4

3

  • Legs
    • Hind legs adapted for jumping - Siphonaptera
    • No legs adapted for jumping - Phthiraptera

4

  • Cerci
    • Present - 5
    • Not present - 6

5

  • Orientation of cerci
    • Pointing towards tailing end of body - Archeognatha
    • Outer two cerci point away from body - Thysanura

6

  • Mouthparts
    • Mouthparts external and easily visible - 9
    • Mouthparts not easily visible - 7

7

  • Presence of eyes
    • Simple eyes present - Collembola
    • No eyes present - 8

8

  • Antennae
    • Not present - Protura
    • Present - Diplura

9

  • Mouthparts
    • Adapted for sucking - Hemiptera
    • Adapted for chewing - 10

10

  • Pincer-like cerci on abdomen

11

  • Forelegs
    • Forelegs raptatorial - Mantodea
    • Forelegs not raptatorial - 13

12

  • Number of wings
    • One pair - 17
    • Two pairs - 18

13

  • Narrow waist
    • Present - Hymenoptera
    • Not present - 14

14

  • Body shape
    • long and thin - Phasmatodea
    • Round and stout - 15

15

  • Body width
    • Flattened - Blattodea
    • Not flattened - 16

16

  • Social structure
    • Solitary - Psocoptera
    • Social - Isoptera

17

  • Wings
    • Forewings reduced to knobs - Strepsiptera
    • Hindwings reduced to knobs - Diptera

18

  • Forewings
    • Membranous - 19
    • Not membranous - 31

19

  • Wing texture and color
    • Covered in scales or hairs - 37
    • Transparent - 20

20

  • Tail-like appendages
    • Present - 21
    • Not present - 23

21

  • Comparative wing size
    • Roughly equal - 22
    • Forewings much larger than hindwings - Ephemeroptera

22

  • Comparative cerci size
    • Both abdominal cerci approximately equal in size - Plecoptera
    • Abdominal cerci unequal in size - Embioptera

23

  • Wing venation
    • Extensive - 28
    • Minor - 24

24

  • Narrow waist
    • Present - Hymenoptera
    • Not present - 25

25

  • Wing texture
    • Fringed with hairs - Thysanoptera
    • Not fringed with hairs - 26

26

27

  • Position of wings at rest
    • Held flat against body - Isoptera
    • Held over body - Psocoptera

28

  • Position of wings at rest
    • Held away from body - Odonata
    • Held against body - 29

29

  • Beak-like head
    • Present - Mecoptera
    • Not present - 30

30

  • Main wing veins
    • Forked near end - Neuroptera
    • Not forked near end - Megaloptera

31

32

  • Forewings hardened
    • Forewings hard - 33
    • Forewings not hardened (may be leathery) - 34

33

34

  • Hind legs

35

  • Forelegs
    • Raptatorial - Mantodea
    • Not raptatorial - #36

36

  • Body shape
    • Broadly flattened - Blattodea
    • Long and skinny - Phasmatodea

37

  • Wing covering
Last modified on 6 September 2009, at 23:01