::: What bug is this? ::: / Whit six legs - model 1

Whit six legs - model 1

Basic morphology of an insect whit six legs - click to enlarge
 
The different steps may contain scientific terms which may seem encouraged - I will recommend to search the word on google. Meanwhile, I am looking for pictures to illustrate each step - It is also the intention that these images will illustrate the foreign words. Can you help or do you maybe have access to such images, then I would be very happy to hear from you. Contact me here
 
  1. - Insect with wings or wingcases, Go to 2
    - Insect without wings, Go to 27

  2. - Insects with four wings (two pairs), Go to 3
    - Insects with only two wings (one pair), Go to 25

  3. - Wings covered with scales = Butterflies and Moths (Lepidoptera)
    - Wings not covered with scales, though they may be hairy, Go to 4

  4. - Fore-wings partly or entirely horny or leathery and used as covers for
    hind-wings often much narrower than hindwings, Go to 5
    - Both pairs of wings entirley membranous (flexible) and used for flying,
    Go to 12

  5. - Mouth-parts tube-like, adapted for piercing and sucking = True Bugs (Hemiptera)
    - Mouth-parts adapted for biting and chewing, Go to 6

  6. - Fore-wings and hind-wings with veins, hind-wings stiffer and harder than
    and serving as covers for hind-wings, Go to 7
    - Fore-wings without veins, and modified into hard, horny cases for hind-wings, Go to 10

  7. - Body dorsoventrally flattened = Cockroaches Dictyoptera; (Blattodea)
    - Body rounded or quadrate in section, Go to 8

  8. - Forelegs raptorial, adapted for grasping and holding = Preying Mantids, (Dictyoptera; Mantodea)
    - Forelegs not raptorial, Go to 9

  9. - Prothorax as large as or larger than meso and meta thorax, hind legs generally enlarged and adapted for jumping = Grasshoppers and Crickets (Orthoptera)
    - Prothorax smaller than meso and meta thorax, legs normally similar in thickness, if hind legs enlarged then not used for jumping = Stick-Insects (Phasmida)

  10. - Fore-wings short, Go to 11
    - Fore-wings as long as, or nearly as long as abdomen the 2 wings may be joined where they meet along the animals back and hence never used for flying = Beetles (Coleoptera)

  11. - End of abdomen with characteristic pair of forceps like cerci = Earwigs, (Dermaptera)
    - End of abdomen with out characteristic forceps like cerci = Beetles (Coleoptera; Staphylinidae)

  12. - Wings narrow and without veins, but fringed with long hairs. Very small insects, about 5 mm in length = Thrips (Thysanoptera)
    - Wings more fully developed, and with veins present, Go to 13

  13. - Hind-wings noticeably smaller than fore-wings, Go to 14
    - Hind-wings similar in size to or larger than fore-wings, Go to 19

  14. - Abdomen with two or three long 'tails'. Fore-wings with a large number of cross-veins, making a net-like pattern = Mayflies (Ephemeroptera)
    - Fore-wings with fewer veins, not forming a net-like pattern, usually without 'tails', Go to 15

  15. - Wings obviously hairy. Mouth-parts very small, except forpalpi = Caddisflies (Trichoptera)
    - Wings not obviously hairy, though tiny hairs can be seen under the microscope, Go to 16

  16. - Mouth-parts well developed and adapted for biting and chewing, Go to 17
    - Mouth-parts tube-like, adapted for piercing and sucking = Aphids; Cicadas etc,. (Hemiptera; Homoptera)

  17. - Very small insects, soft-bodied, mostly less than 6 mm. in length. tarsi with only two or three segments, Go to 18
    - Often much bigger, wasp-like or bee-like insects; or if very small, then hard-bodied, with abdomen narrowed at its base into a petiole, or 'waist'. tarsi with four or five segments = Bees, Wasps, Ants and Sawflies (Hymenoptera)

  18. - Antennae with 9 segments only =rare Zoraptera
    - Antennae with 12 to 50 segments = Bark or Book Lice (Psocoptera)

  19. - Tarsi with three or four segments only, Go to 20
    - Tarsi with five segments, Go to 23

  20. - Tarsi with 3 segments only; first segment of anterior (front) legs greatly swollen = Webspinners (Embioptera)
    - Tarsi with 3 or 4 segments, if 3 then first segment of anterior legs not swollen, Go to 21

  21. - Wings with few cross-veins, fore-wings differently shaped to hind-wings which are greatly expanded posteriorly = Stoneflies (Plecoptera)
    - Wings with numerous cross veins, fore- and hind-wings usually very similar in shape,though hind-wings occasionally enlarged posteriorly, Go to 22

  22. - Small insects, generally much less than 1 inch. (25 mm.) in length with long antennae, and with wings folded flat over body = Termites (Isoptera)
    - Generally longer than 1 inch., with very short antennae. Wings held away from body when at rest = Dragonflies (Odonata)

  23. - Mouth-parts prolonged into a beak = Scorpionflies (Mecoptera)
    - Mouth-parts short, Go to 24

  24. - Most of the veins in forewings divide or fork just before they reach the wing edge, hind-wings broader than fore-wings at least at base = Alderflies, Snakeflies, (Megaloptera)
    - Few or no veins in the forewings fork immediatley before the wing edge, hind-wings similar to fore-wings = Lacewings (Neuroptera)

  25. - Hind-wings absent or reduced knob-like organs (called halteres), Go to 26
    - Forewings absent or reduced to knob-like organ = Stylops (Strepsiptera)

  26. - Hind-wings reduced or modified to knob-like organs (called halteres) Mouth-parts of various forms = True Flies Diptera (Also males of Homoptera, family Coccidae, but these are very rare)
    - Hind-wings entirely absent; no halteres = Some Mayflies (Ephemeroptera)

  27. - Some segments with jointed legs, which can be used for movement, Go to 28
    - No jointed legs; or if these are present and visible, then they are enclosed in membrane, and cannot move = Larvae and Pupae of Endopterygota (You will need specialised keys to get these to order)

  28. - Animals found living as parasites on warm-blooded animals, or found closely associated with them i.e. in their nests or dens, Go to 29
    - Animals not found living as parasites on warm-blooded animals: either freeliving, or parasitic on other insects, snails etc., Go to 34

  29. - Body flattened from side to side, hard and bristly, with strong legs, jumping insects, found on birds and mammals = Fleas (Siphonaptera)
    - Insects not as above, body either rounded or flattened from above, Go to 30

  30. - Mouth-parts adapted for biting and or chewing, Go to 31
    - Mouth-parts adapted for piercing and or sucking, Go to 32

  31. - Posterior end of the body with cerci. Found on bats and small rodents in tropical environments only = Parasitic earwigs (Dermaptera)
    - Posterior end of body without cerci. On birds or mammals all over the world = Chewing lice (Mallophaga)

  32. - Flattened, rather spider-like insects, with head fitting into a notch on thorax, and with antennae not visible. Claws hooked = Louseflies and Batflies (Diptera)
    - Not spider-like. Antennae clearly visible, Go to 33

  33. - Snout (proboscis) short, unjointed. Body long and narrow. Tarsi of legs with one large, hooked claw. Permanent parasites of birds and mammals = Sucking lice, (Anoplura)
    - Snout (proboscis) longer, jointed. Body more oval. tarsi with two small claws, not hook-like. Only temporary parasites = Wingless bugs (Hemiptera)

  34. - Terrestrial: living on dry land, or on animals other than mammals and birds, Go to 35
    - Aquatic: mostly nymphal forms of terrestrial insects, Go to 60

  35. - Mouth-parts not visible. Abdomen with appendages on some of the abdominal segments, or with a forked 'spring' near tip, Go to 36
    - Mouth-parts clearly visible, Go to 39

  36. - Abdomen with six segments or fewer, usually with a forked appendage ('spring') near tip. No long bristles at tip of abdomen = Springtails (Collembola)
    - Abdomen with nine or more segments. No spring, but several segments have simple appendages, Go to 37

  37. - Cerci present, sometimes appearing as clasping forceps, Go to 38
    - No cerci = Protura

  38. - A central 'cerciform tergum' projects between the cerci giving the appearance of 3 'tails' = 3-Pronged Bristletails (Thysanura)
    - No central 'cerciform tergum', hence having the appearance of 2 'tails' = 
    2-Pronged Bristletails (Diplura)

  39. -Mouthparts mostly adapted for piercing or sucking, Go to 40
    - Mouth-parts not as above, adapted for biting and or chewing, Go to 44

  40. - Body covered with scales and or dense hairs = Wingless Moths (Lepidoptera)
    - Body bare, or with few scattered hairs, Go to 41

  41. - Almost all of thorax that is visible above is composed of the middle segment, -the mesothorax: prothorax and metathorax both small and hidden = Wingless True flies (Diptera)
    - Mesothorax and metathorax about equally developed. Prothorax also is usually visible from above, Go to 42

  42. - Snout (proboscis) small, cone-shaped. Body long and narrow. Claws usually absent = Thrips (Thysanoptera)
    - Snout (proboscis) longer, jointed. Body more or less oval. Claws present, Go to 43

  43. - Proboscis arising from front part of head. Abdomen without cornicles near tip = Wingless Bugs (Hemiptera)
    - Proboscis arising from hind part of head. Abdomen often with two cornicles at or near its tip = Aphids (Hemiptera; Homoptera)

  44. - Abdomen with false or pro-legs, which are fleshy, and different from the jointed legs of the thorax. Caterpillar-like, Go to 45
    - Abdomen without any kind of legs, only thorax has legs, Go to 47

  45. - Five pairs of prolegs, or fewer, with minute hooks (crochets); none on the1st or 2nd abdominal segments = Caterpillars (Lepidoptera)
    - Six to ten pairs of prolegs, always with one pair on the 2nd abdominal segment. No crochets present, Go to 46

  46. - Head with a single ocellus (small eye) on each side = Larvae of Sawflies, (Hymenoptera; Symphyta)
    - Head with several ocelli on each side = Larvae of Scorpionflies, (Mecoptera)

  47. - Antennae short and indistinct. Larvae, Go to 48
    - Antennae long and distinct. Adult insects, Go to 50

  48. - Body Caterpillar-like, Go to 49
    - Body not caterpillar-like = Larvae of some endopterygote insects (Neuroptera or Coleoptera)

  49. - Head with six ocelli on each side of headsome = Caterpillars (Lepidoptera)
    - Head with more than six ocelli on each side = Larvae of some Mecoptera

  50. - Abdomen with a pair of movable forceps like cerci at tip = Earwigs (Dermaptera)
    - Abdomen without such forceps, Go to 51

  51. - Abdomen strongly constricted at base into a 'waist'. Sometimes antennae are bent into an elbow = Ants and wingless Wasps (Hymenoptera)
    - Abdomen not constricted into a waist, Go to 52

  52. - Head prolonged underneath body into a long beak, which bears mandibles at its tip = Scorpionflies (Mecoptera)
    - Head not prolonged into a beak, Go to 53

  53. - Tiny soft insects, Go to 54
    - Fairly small, to very big, usually hard-bodied insect, Go to 55

  54. - Cerci absent = Booklice and Barklice (Psocoptera)
    - Cerci present = Zoraptera

  55. - Hind-legs enlarged for jumping = Grasshoppers/Crickets, (Saltatoria; Orthoptera)
    - Hind-legs not enlarged for jumping, Go to 56

  56. - Tarsi of legs with four segments. Pale, soft-bodied insects living in wood or soil = Termites (Isoptera)
    - Tarsi of legs with five segments. More highly coloured insects, Go to 57

  57. - Body dorsoventrally flattened = Cockroaches Dictyoptera; (Blattodae)
    - Body not dorsoventrally flattened rounded or squarish in section, Go to 58

  58. - Cerci long, containing 8 segments, eyes reduced or absent= Grylloblattodae
    - Cerci not as above, eyes well developed, Go to 59

  59. - Fore-legs modified for grasping and holding, predatory = Dictyoptera; Mantodae
    - Fore-legs not so modified = Stick Insects (Phasmida)

  60. - Mouth-parts adapted for piercing and sucking = Nymphs of Water-bugs, (Hemiptera and larvae of some Neuroptera)
    - Mouth-parts adapted for licking and chewing, Go to 61

  61. - Body enclosed in a case made of pebbles, sand and debris = Larvae of Caddisflies, (Trichoptera)
    - Body not enclosed in such a case, Go to 62

  62. - Abdomen with external gills, Go to 63
    - Abdomen without external gills, Go to 64

  63. - With two or three long processes at tip of abdomen, traces of wing-cases may be visible in later instars = nymphs of Mayflies (Ephemeroptera)
    - Only one process at tip of abdomen, and no wing-cases visible = Alderflies, (Megaloptera; Sialioidea)

  64. - Head with a 'mask', bearing the jaws which is capable of being extended far forwards of the insect's body = Nymphs of Dragonflies (Odonata)
    - Head without such a mask, Go to 65

  65. - With long antennae; and long filaments at tip of abdomen = Larvae of Stoneflies, (Plecoptera)
    - Without such filaments = Larvae of Beetles (Coleoptera)
 
 
This key is found on the page www.earthlife.net - an exelent page
and diffently worth a look. The Key is adapted from Harold Oldroyd 1958 
 
Arthropods - Quick Checklist
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- One pair of wings 
- Hind wings reduced to tiny knobs (halteres)

EPHEMEROPTERA (Mayflies)
- Very soft body
- Tip of abdomen with 2-3 thread-like tails (caudal filiments)
- Usually with two pairs of wings (sometimes one pair)
- When there are two pairs of wings, hind wings are much smaller than front wings

LEPIDOPTERA (Moths / Butterflies)
- Two pairs of wings covered with powdery scales
- Mouthparts usually a coiled tube (proboscis) for sucking

TRICHOPTERA (Caddisflies)
- Two pairs of wings covered with hair
- Wings held roof-like at rest

HOMOPTERA (Hoppers and Aphids)
- Sucking mouthparts in the form of a rigid beak
- Antennae often short and bristley
- Two pairs of wings (sometimes without wings)
- When wings are present, they are held roof-like at rest
- Body sometimes with hard projections that make it look like a thorn
- Forms without wings (aphids) have very soft bodies with two short projections (cornicles) at the tip of the abdomen

NEUROPTERA (Lacewings)
- Two pairs of wings with many cross veins, sometimes bright green
- Wings held roof-like at rest

PSOCOPTERA (Bark lice)
- Tiny insects with very soft, pale colored bodies
- Relatively long antennae
- Chewing mouthparts
- Two pairs of wings or without wings
- When wings are present, they are held roof-like at rest

ODONATA (Dragonflies & Damselflies)
- Antennae always short and bristley
- Abdomen always long
- Two pairs of wings
- Front and hind wings similar in texture, size and shape

ISOPTERA (Termites)
- Usually found in colonies with many individuals, some of which may have very large mandibles (soldier caste)
-Very soft, pale colored bodies
- Two pairs of wings or without wings
- When wings are present, front and hind wings are similar in size and shape, and held flat over abdomen when at rest

MECOPTERA (Scorpionflies)
- Head elongated into a "beak"
- Males with the last abdominal segment enlarged and held over the body like a scorpion's stinger
- Two pairs of wings (occasionally tiny or missing wings)
- Front and hind wings similar in texture, size and shape

HYMENOPTERA (Bees, Wasps, Ants)
- Body often with a narrow "waist"
- Two pairs of wings (bees and wasps), sometimes without wings (ants and wingless wasps)
- When wings are present, hind wings are smaller than front wings
- Antennae of the wingless forms usually have a bend in the middle

PLECOPTERA (Stoneflies)
- Body very soft, with two projections (cerci) at the end of the abdomen
- Two pairs of wings, hind wings wider than front wings
- At rest, the hind wings are folded underneath the front wings, and held flat over the abdomen

HETEROPTERA (Bugs)
- Front wings with clear tips (hemelytra), overlapping at rest, revealing a triangular panel on the back (scutellum)
- Front wings a rigid or leathery covering for clear hind wings
- Sucking mouthparts in the form of a rigid beak

COLEOPTERA (Beetles)
- Rigid front wings (elytra) meet in a straight line down the middle of the back
- Front wings (sometimes tiny) a rigid or leathery covering for clear hind wings
- Chewing mouthparts

BLATTARIA (Cockroaches)
- Front wings a rigid or leathery covering for clear hind wings
- Head hidden from above by a hood-like structure (pronutum)
- Chewing mouthparts
- Fast runners

MANTODEA (Mantids)
- Strong front legs with prominent spines for grasping prey, hind legs long and slender
- Front wings a rigid or leathery covering for clear hind wings
- Chewing mouthparts

ORTHOPTERA (Grasshoppers & Crickets)
- The femora of the hind legs are enlarged for jumping
- Front wings a rigid or leathery covering for clear hind wings
- Chewing mouthparts

PHASMIDA (Walking sticks)
- Slow-moving, resembles a twig
- Long, thin body with tiny or missing wings

COLLEMBOLA (Springtails)
- Very soft body, often smaller than 2mm
- Usually with a spring-like structure (furcula) on the underside of the abdomen used for jumping
- Without wings
- Mouthparts hidden within head

THYSANOPTERA (Thrips)
- Tiny insects with very soft, slender bodies
- Fairly short antennae
- Sometimes without wings, but adults may actually have barely visible wings with fringes of hair
- Sucking mouthparts

SIPHONAPTERA (Fleas)
- Tiny jumping parasites almost always found on mammals or birds, where they suck blood
- Body has flattened sides
- Without wings

DERMAPTERA (Earwigs)
- Prominent "pincers" (cerci) at the tip of the abdomen
- Tiny or missing wings
 
Found on www.amnh.com
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