Coleopteran

Univoltine, although bivoltine and semivoltine life cycles have been recorded.

Some species complete larval development rapidly others several weeks. Semivoltine life cycles may need almost two years to complete larval development.

Adults are long-lived, with records of unmated beetles living for several years.

Most adults live several months and die after their final mating and oviposition, which is usually in spring.

Restricted to mountain streams in northwestern North America.

Short Broad urogomphi.

Larvae cannot swim and adults swim very poorly.

Hunt Stone fly nymph.

Year to complete life cycle.

long setae on their legs.

Most aquatic Coleoptera crawl on vegetation

Indent or notch on the head

Some have narrow urogomphi

Many have cutaneous respiration.

Found in marshes and pounds.

Eaten in Vietnam and Asian countries as a delicacy.

Divided compound eyes use to look for prey or survey surroundings.

Seen resting or swimming in groups of a few to several hundred.

they often swim under the surface.

Swim with a vertical undulating motion when disturbed.

Found in debrie in steams

Yellow to orange colored with spots on them.

2.5 mm long

Narrow elytra and narrow thorax.

Coxal or Metacoxal plate.

Vegetation is an important part of the development.

Larvae and adults are herbivores

Feed on algae

Relavtivly small family.

Found the Western U.S.

Streamline body shape.

V-shaped meta sternal plate and prosternal.

Plant tissues are where pupae occur. They use plants to obtain oxygen sources.

One year life cycle

Short elytra

Feed on algae

Survive hot springs at 44 Celsius

Crawl on vegetation with a long terminal segment