Only a single genus, Cordulegaster,
with 7 NA spp occurs in this Family. Adults are large and black with
paired yellow stripes laterally on the thorax and yellow markings down
the dorsum of the abdomen. Their eyes meet at a single point atop
the head. Larvae are elongate cylindrical with labial palps armed with
wicked jagged teeth. They occur in slow-water, silt-bottomed areas
of streams, both large and small. Two species reported for Minnesota:
C. maculata is common over much of the northern half of the state,
C. obliqua is a rare species of seepage to the St. Croix River in
Washington Co. This genus unlikely to occur at Cedar Creek.
