INTRODUCTION
As
their name implies, damselflies are delicate insects.
They have a gentle, fluttering flight style, so they often
fly amid vegetation rather than in the open. But, like
their larger relatives the dragonflies, they are predatory
insects with voracious appetites; they take a toll of
midges, mosquitoes, and other insect prey as they feed.
In
size the Kansas species range from tiny pond damsels,
an inch or so in length, to the Great Spreadwing, almost
two and a half inches long. Their colors vary widely.
The spectacular Ebony Jewelwing has black, shining wings
that look as if they were carved from a semi-precious
stone. It has a metallic green body with an iridescent
glow that brightens the shady woods it frequents. On the
other hand, some of the drab female pond damsels are shades
of tan and muted pastel colors. They are so inconspicuous
that we have to search carefully through the sedges and
grasses to find them.
While
their retiring habits require more care on our part to
bring them to our notice, once we find them, their habits
also make them easy to study, since they carry out their
life's work in confined areas. Some of the most thorough
studies of damselfly behavior were done by George and
Juanda Bick, who spent many summers observing pond and
stream species in Oklahoma. Their articles (Ref. 6-10)
are worth looking for in the library, as they document
the lives of many of the damselflies commonly found in
Kansas.
Damselflies
and dragonflies are placed into the Order Odonata, damselflies
in Suborder Zygoptera, dragonflies in Suborder Anisoptera.
The dragonflies of Kansas were the subject of an earlier
issue of the Kansas School Naturalist (Ref. 5).
Both suborders are aquatic in their immature stages, and
are usually found near the water as adults.
Damselflies
lay their eggs into plant tissue. The immature damselfly,
called a nymph or larva, lives in the water for one or
more years, undergoing as many as 15 molts as it grows.
The larva possesses a hinged and hooked lower lip which
folds beneath the head and can be extended out to grasp
and pull back its prey. Damselfly larvae have three leaf-like
external gills at the ends of their abdomens which are
also used like fins to help them swim.
Eventually
the damselfly larva climbs from the water to undergo a
final molt in which the adult insect emerges from the
larval skin. The newly emerged insect is relatively soft,
and is quite vulnerable to predation. It flies away from
the water to mature, returning later to mate.
Damselflies
have a variety of approaches to reproduction. Members
of the family Calopterygidae are quite territorial and
the males sometimes use a courtship display to woo potential
mates. In the families Coenagrionidae and Lestidae there
are no courtship displays, but the female usually oviposits
while being held in tandem by the male. In some cases,
the male guards the female as she oviposits to protect
her from other males.
It
is fascinating and instructive to watch damselflies at
the pond or stream and to learn from observation how they
go about their lives. This issue will help you to identify
living adult damselflies; Ref's. 27 & 28 cover larval
identification. Use these resources to help you learn
more about damselflies in Kansas.