       |
Stream Insects & Crustaceans
GROUP ONE: Polluton-sensitive
organisms found in good-quality
water:
- Stonefly: Order Plecoptera. 1/2. -I 1/2", 6 legs with hooked tips, antennae, 2 hair-like tails. Smooth (no gills) on lower half of body. (See arrow.)
- Mayfly: Order Ephemeroptera.
1/4" -1", brown, moving, platelike or feathery gills on sides of lower body (see arrow). 6 large hooked legs, antennae, 2 or 3 long hair like tails. Tails may be webbed together.
- Waterpenny: Order Coleoptera.
1/4" flat saucer-shaped body with a raised bump on one side and 6 tiny legs on the other side. Immature beetle.
GROUP TWO: Somewhat pollution-tolerant organisms can be in good- or fair-quality water.
- Crawfish: Order Decapoda.
Up to 6", 2 large claws, 8
legs, resembles a small lobster.
- Crane Fly: Suborder Nematocera. 1/3" - 2",
milky, green, or light brown; plump caterpillar-like segmented body; 4 finger-like lobes at back end.
- Pooch Snail end Pond Snails: Class Gastropoda. Breathe air. Shell usually opens on left.
- Dragon Fly: Suborder Anisoptera. 1/2" - 2", large eyes,
6 hooked legs. Wide oval to round abdomen.
|