Orders of Stream Dwelling Macroinvertebrates

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Orders of Stream Dwelling Macroinvertebrates

• Hemiptera
• Collembola
• Odonata
• Diptera

• Ephemeroptra
• Plecoptera
• Trichoptera
• Megaloptera
• Coleoptera

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Follow these rules for larvae, does not apply to
pupa and adults
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Ephemeroptera
Mayflys

• Identification
• Three Tails
• Single Tarsal Claws
• Usually with lateral Gills

Note Epeorous-Heptageniidae has only two tails,
but has a single tarsal claw
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Plecoptera

• Identification
• Two Tails
• Double Tarsal Claws
• Usually without Lateral Gills

Stoneflys
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Tricoptera
Casebuilders Caddis Fly

• Identification
• Abdomen with two pro-legs each with a Single anal
  hook
• Three pairs of segmented legs

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Megaloptera
Doesnt Build A Case

• Identification
• Abdomen with two pro-legs each ending in a Pair
  of Anal Hooks
• Three pairs of segmented legs
• Ex. Hellgrammites

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Coleoptera
Beetles

• Identification
• Wing Pads Absent
• Thorax with 3 pairs of jointed legs.
• Abdomen not terminating in a false pair of legs,
  but terminal claws may be present never builds a
  case

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Hemiptera

• Identification
• Mouthparts forming a long piercing beak
• Ex. Water Striders

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Collembola

• Identification
• No wing pads
• Lacks Three pairs of segmented legs
• Usually possesses a forked jumping organ, on
  underside

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Odonata
Damsel Fly Dragon Fly

• Identification
• Extendable lower jaw

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DipteraTrue Flys

• Identification
• Without segmented legs
• Some with Thoracic pro-legs
• Ex. Mosquito