group ii somewhat pollution-tolerant benthic macroinvertebrates
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Group IIGroup IISomewhat Pollution-Somewhat Pollution-
Tolerant Benthic Tolerant Benthic MacroinvertebratesMacroinvertebrates
CrayfishCrayfish
Looks like a small Looks like a small lobsterlobster
MDC photo
Sow BugSow Bug
Looks like a “roly Looks like a “roly poly”poly”
Flattened “top to Flattened “top to bottom”bottom”
MDC photo
NABS photo
ScudsScuds
Swims sidewaysSwims sideways
Many Many appendages on appendages on abdomenabdomen
Flattened “side to Flattened “side to side”side”
Often mistaken Often mistaken for a freshwater for a freshwater shrimpshrimp
MDC photo
NABS photo
Alderfly LarvaeAlderfly Larvae Lateral filamentsLateral filaments
No visible gillsNo visible gills
One long hair-like One long hair-like tailtail
Tail filaments may Tail filaments may resemble capital resemble capital letter “A”letter “A”
Photo courtesy of J. Abbott, U of Texas
NABS photo
Alderfly AdultAlderfly Adult
NABS photo
Fishfly LarvaeFishfly Larvae Similar to Similar to
dobsonfly larvaedobsonfly larvae Lateral filamentsLateral filaments MandiblesMandibles Generally smallerGenerally smaller
No visible gills on No visible gills on abdomen!abdomen!
MDC photos
Fishfly AdultFishfly Adult
NABS photo
Damselfly NymphsDamselfly Nymphs Six spindly legsSix spindly legs
Long, slender bodyLong, slender body
Three broad oar-Three broad oar-shaped tailsshaped tails
Positions like a Positions like a tripod when in tripod when in waterwater
MDC photo
Photo courtesy of R. DiStefano
Damselfly AdultsDamselfly Adults
Photo courtesy of B. Blake
NABS photo
Damselfly AdultsDamselfly Adults(mating)(mating)
NABS photo
Dragonfly NymphsDragonfly Nymphs Six legsSix legs
Wide, oval to Wide, oval to round abdomenround abdomen
Large eyesLarge eyes
Scoop like lower lipScoop like lower lip
NABS photos
Dragonfly AdultDragonfly Adult
NABS photo
Watersnipe Fly LarvaeWatersnipe Fly Larvae
Caterpillar likeCaterpillar like
Two feathery Two feathery “horns” on end “horns” on end of abdomenof abdomen NABS photo
Crane Fly LarvaeCrane Fly Larvae
Caterpillar likeCaterpillar like
Up to 4” longUp to 4” long
May have May have enlarged lobe or enlarged lobe or fleshy finger like fleshy finger like extensions at extensions at end of abdomenend of abdomen
NABS photos
Crane Fly AdultCrane Fly Adult
NABS photo
Mussels and ClamsMussels and Clams
> 70% of > 70% of species species threatened or threatened or endangeredendangered
Count and put Count and put back hinge side back hinge side upup
MDC photos