1. General Pollution Tolerance
Sensitive
Moderately Sensitive
Intermediate
Moderately Tolerant
Tolerant

2. Dobsonflies & Alderflies
Order Megaloptera
General Characteristics:
Wing pads absent
Abdomen has well defined lateral filaments
Abdomen ends with long filament or a pair of prolegs each with 2 hooks.
Dobson Fly
( Family Corydalidae)
Alder Fly
(Family Sialidae)

3. Mayflies General Characteristics: Order Ephemeroptera
Filamentous antennae
1 tarsal claw
Presence of lateral or ventrolateral gills on most of segments 1-7
Majority have 3 caudal filaments
Wingpads are present

4. Mayflies Order Ephemeroptera Family Baetidae Family Ephemeridae
Family Ephemerellidae
Family Heptageniidae
Family Baetidae
Family Ephemeridae
Family Leptophlebiidae
Family Caenidae
Family Isonychiidae
Family Tricorythidae

5. Caddisflies General Characteristics: Order Trichoptera
3 pair of thoracic legs near head
Single tarsal claw
Abdominal gills
Head subdivided into 3 parts by Y-shaped lines
Short anal prolegs without joints at end of abdomen, with pointed claws
No wing pads

6. Caddisflies Order Trichoptera Family Leptoceridae Family Hydroptilidae
Family Helicopsychidae
Family Hydroptilidae
Family Hydropsychidae
Family Polycentropodidae

7. Dragonflies & Damselflies
Order Odonata
General Characteristics:
Easily distinguished from all other aquatic insects
Large body size
Elongated hinged lower lip (labium) modified for seizing prey
Wing pads present
Suborder: Anisoptera
Dragonflies
Suborder: Zygoptera
Damselflies

8. Dragonflies General Characteristics: Suborder Anisoptera
Abdomen relatively broad and terminates in three triangular shaped cerci
Some move by rapidly expelling water through rectal chamber
Most are burrowers or clingers
Labium forms spoon-shaped mask fitting over the lower part of head and mouth parts; others have a flat labium

9. Dragonflies Suborder Anisoptera Family Libelluidae Family Aeshnidae
Family Corduliidae
Family Gomphidae

10. Damselflies General Characteristics: Suborder Zygoptera
Abdomen long and thin ending in 3 long vertically oriented gills (caudal lamellae)
Swim by moving abdomen from side to side
Most cling to plants and other objects
Labium longer and narrower than the dragonfly’s

11. Family Calopterygidae
Damselflies
Suborder Zygoptera
Family Coengrionidae
Family Calopterygidae

12. Stoneflies General Characteristics: Order Plecoptera Long Antennae
2 claws on each tarsus
Gills, if present, on head, thorax, or basal segments of abdomen
2 long caudal filaments or cerci
Wing pads

13. Deerflies or Horseflies
True Flies
Order Diptera
Deerflies or Horseflies
Black Flies
Family Tabanidae
Midges
Family Simulidae
Family Chironomidae
Crane Flies
Red-Tail Maggots
Family Tipulidae
Family Syrphidae
Mosquitoes
Family Culicidae

14. Family Belostomatidae
True Bugs
Giant Waterbugs
Order Hemiptera
Back Swimmers
Water Boatmen
Family Belostomatidae
Family Notonectidae
Family Corixidae
Water Scorpions
Creeping Waterbugs
Family Nepidae
Broad Shouldered
Water Striders
Family Naucoridae
Water Striders
Family Gerridae
Family Veliidae

15. Beetles Order Coleoptera Family Psephenidae Family Dytiscidae
Water Pennies
Family Psephenidae
Predaceous Diving Beetles
Family Dytiscidae
Water Scavenger Beetles
Family Hydrophilidae
Whirligig Beetles
Family Gyrinidae
Riffle Beetles
Family Elmidae

16. Aquatic Caterpillars Unsegmented Worms Order Lepidoptera
Family Pyralidae
Unsegmented Worms
Phylum Platyhelminthes
Class Turbellaria

17. Segmented Worms Phylum Annelida Class Hirudinae Class Oligochaeta
Leeches
Class Hirudinae
Bristle Worms
Class Oligochaeta

18. Crustaceans Class Crustacea Order Isopoda Order Decapoda
Southeastern river Shrimp, Southern Prawns, and Grass Shrimp
Families: Macrobrachium
Palaemonetes
Crayfish
Family Cambaridae
Order Isopoda
Sowbugs
Family Asellidae

19. Microscopic Crustaceans
Class Crustacea
Order Amphipoda
Sideswimmers or Scuds
Families: Gammaridae
Hyalellidae
Order Copepoda
Order Cladocera
Free-Living Copepods
Microscopic Crustaceans
Daphnia

20. Molluscs Water Mites Phylum Mollusca Class Pelecypoda Class Gastropoda
Clams
Class Pelecypoda
Snails and Limpets
Class Gastropoda
Water Mites
Class Arachnida
Order Acarina
Suborder Hydracarina