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Mandible

Labium (“lower lip”). Labrum (“upper lip”). Mandible. Maxilla. Palp. Antenna. Pronotum (“back”) Prosternum (“belly”). Mesanotum (“back”) Mesasternum (“belly”). Femur. Tibia. Metanotum (“back”) Metasternum (“belly”). Tarsus. Cerci. Damselfly nymph.

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Mandible

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  1. Labium (“lower lip”) Labrum (“upper lip”) Mandible Maxilla Palp Antenna Pronotum (“back”) Prosternum (“belly”) Mesanotum (“back”) Mesasternum (“belly”) Femur Tibia Metanotum (“back”) Metasternum (“belly”) Tarsus Cerci

  2. Damselfly nymph Odonata (damsel and dragonfly) nymph characteristics 3 Anal lobes or points Lower lip is a scoop-like structure longer than head No visible gills 6 legs

  3. Dragonfly nymph

  4. Ephemeroptera (mayfly) nymph characteristics: 6 legs 2 or 3 cerci Gills on abdomen

  5. Gills on abdomen

  6. Tusks

  7. Adult Ephemeroptera

  8. Mayfly swarm

  9. Plecoptera (stonefly) nymph characteristics Six legs 2 cerci Gills on thorax - none on abdomen

  10. Adult stonefly Plecoptera means “hinged wings”

  11. Trichoptera (caddisfly) larvae characteristics 6 legs Often cased (not always) VERY small antennae Gills on abdomen

  12. Cased caddis - after being taken out of it’s case

  13. Hydropsychidae (case-less caddisflies)

  14. Trichoptera pupae

  15. Coleoptera (beetle) characteristics Adults: hardened outer wings Relatively long hind legs Larvae: Hardened head capsules 6 legs Elongated abdomens

  16. Dytiscidae (predaceous diving beetles)

  17. Diptera larvae (flies) characteristics No legs - worm-like At least some part of the head capsule is hardened

  18. Chironomidae (Non-biting midges) in Order Diptera (flies)

  19. Adult Chironomid

  20. Simulidae (black fly)

  21. Hemimetabolous Nymph Adult

  22. larvae pupae adult Holometabolous

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