1. Pennsylvania Fresh Water Macroinvertebrates
Pennsylvania Fresh Water Macroinvertebrates
By:
Nick Bonney

2. Mayfly nymph Usually have three long tails also called cerci
Usually have three long tails also called cerci
They have a single claw on each leg
Short antennae
Size: 15 mm or less.
Are sensitive to low levels of oxygen in the water. They prefer cool water. They are sensitive to chemical pollution in the water, and sunlight
larvae have elongated bodies that are slightly flattened
Live on the bottom for upwards of 2 years.

3. Mayfly Adult
Short lifespan, only a few hours long just long enough to mate and lay eggs
Head is large with round prominent eyes
Different species range from about 1/4 to 1-inch long.
Adults are pale yellow with brownish stripes and a reddish brown thorax

4. Facts About Mayflies
Mayfly Nymphs can take from three weeks to two years to become adults.
Adult Mayflies have male and female sexes, but in some species the females can lay unfertilized eggs that hatch into more females. This is called parthenogenesis
One of there main predators are trout

5. Stonefly Nymph Live under stones in fast-flowing streams
Live under stones in fast-flowing streams
On the submerged wood and leaf litter in streams
Tubes of thread-like gills on their underside
Each leg has two claws
Streamline bodies so they don’t get swept away
Eat dead plants and algae
Some stonefly species stalk their prey and are eating other animals.
Very sensitive to low levels of oxygen in water
Can last up to 3 years requiring up to 25 molts to develop completely.
Do not go through a pupa stage and is not considered a complete metamorphosis.

6. Stone fly Adult Long noticeable antennae Two hair-like tails
Long noticeable antennae
Two hair-like tails
Smooth abdomen
Widely separated big eyes
2 separate pairs of wing pads

7. Facts About Stoneflies
Many species have strong color patterns
Often confused with mayfly nymphs but stoneflies have 2 tails and mayflies have 3.
Size: 7-12 mm long
Some species take up to three years to develop into adults.
Adult Stoneflies live only for a week to a month, and females live longer than males.
Over 460 species
Often are 2 toned

8. More Facts About Stoneflies
Most females skim the surface of the stream, dipping their abdomens in the water and releasing their eggs.
Others will crawl to the bottom of the stream and then release their eggs on objects.
Stoneflies are very clumsy fliers and during the egg releasing and will cause splashing on the surface of the water which attracts the attention of fish.

9. Dragonfly Nymph
They are short and chunky with wing pads and internal gills. Their six legs are all located near the head.
Their six legs are all located near the head.
Size: mm long.
They live on plants, among stones, leaf litter, or at the bottom of ponds or slow-flowing water ways.
They are predators and feed mostly on other insects. Sometimes, they can be cannibals and eat each other. Some of the larger species feed on small fish and tadpoles. They catch their food with a toothed lip.
They are sensitive to habitat disturbance and they need aquatic vegetation in the.

10. Dragonfly Adult
adult cannot fold its wings along it's back like its cousin the damselfly

11. Facts About Dragonflies
It breathes by sucking water into its abdomen to move water over its internal gills.
Once it has absorbed the oxygen, it squeezes the water out so it does not have to come up for air like most pond insects.
This also helps jet propel them
Much of a dragonfly's life is spent in the larval stage where it molts six to 15 times.
450 species of dragonflies in North America.

12. Damselfly Nymph
complete life cycle in one year but some take two years. mate over the shallow water, sometimes in flight but often while clinging to the exposed portions of weed beds or shoreline vegetation.
The damselfly nymph is a predator. Usually it lies in wait for other aquatic bugs to get within range and then grabs them with its 'labium' which is much like a modified lower jaw.
The nymph will proceed through 10 to 12 molts before becoming fully developed and ready to come out as an adult. Depending on the species, the adult will live for several weeks to several months before mating and dying.
Size: 25 mm long (one inch)

13. Damselfly Adult
mate over the shallow water sometimes while in flight but often while clinging to the weed beds or other vegetation
after mating, the female will crawl down the vegetation, and into the water to lay her eggs on the submerged vegetation.
Depending on the species, the adult will live for several weeks to several months before mating and dying.
Size: 50 mm(2 inches)

14. Caddis fly larva and nymph
Size: Up to 20 mm long.
They live many bodies of water from fast flowing streams to freshwater ponds. Their soft bodies are usually covered in a protective silky case.
They use their hooks to cling to the stream bed and also to drag themselves backwards to escape from predators.
They eat algae and plants .Some species feed on other insects and spin silky nets to capture their prey. Some eat the larvae of other Caddis fly species, while others scrape algae from stones or plants, or shred leafs.

15. Caddisfly adult Size: about 25mm(1 inch)
Resemble small moths with wings held tent-like over their back when at rest
They have short lives and spend most of their time mating or laying eggs.
Females lay eggs on the edge of the water or dipping their abdomen into the surface of the water. There is usually one generation per year.
Do not feed

16. Facts about Caddis flies
Related to butterflies and moths.
They use silk to build cases from gravel, twigs, needles, or sand, depending on what they find.
They are an important food for many fish
When turned on their side, usually make a C shape.
They cannot tolerate water pollution.
There is usually one generation per year.

17. Mosquito larva

18. All mosquitoes lay eggs in water, which can include large bodies of water, standing water (like swimming pools) or areas of collected standing water (like tree holes or gutters).
Females lay their eggs on the surface of the water, except for Aedes mosquitoes, which lay their eggs above water in protected areas that eventually flood.
The eggs can be laid singly or as a group that forms a floating raft of mosquito eggs. Most eggs can survive the winter and hatch in the spring.