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Mating leatherwings - Click to enlarge | | |
In the fall, a young beetle's fancy turn to thoughts of....... making more beetles.
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PL - click to enlarge
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We are seeing these soldier beetles on flowers in Barb's backyard. These are
Pennsylvania Leatherwings (Chauliognathus pennsylvanicus),
aka Goldenrod Soldier Beetles we will call PL. They are members of the
Cantharidae family of soldier beetles. The "soldier" label comes from
the coloration of this family which reminds some of uniform
decorations. The "leatherwing" refers to their front pair of wings
(elytra) which are hard in most beetles but flexible and leathery in PL.
Many
of them are linked as mating pairs, the female intent on eating and the
male on.....well you know what I mean. They seem to mate non-stop and
at times, finding a single is unusual. "Size matters" as males in a
breeding pair are usually larger than single males nearby.
They
resemble fireflies without the electronic gear, and some sources
suggest that this coloration protects them from predators familiar with
the toxic secretions that fireflies produce. They also manufacture
their own brand of defensive chemical which they can release from their
abdomen.
They are found in large numbers on flowers that bloom
from August through October. They seem to mate non-stop and at times,
finding a single PL is an exception. While feeding on pollen and
nectar, they are also opportunistic omnivores, snacking on small
insects and caterpillars for variety. They do not damage plants and
eat some less desirable insects like aphids.
"Adult females lay their eggs in clusters in the soil. The dark-colored,
long, slender, worm-like larvae are covered with tiny dense bristles,
giving a velvety appearance. They spend their time in the soil, where
they are are predators of other insects, eating grasshopper eggs, small
caterpillars and other soft-bodied insects." Wisconsin Horticulture
Bug of the Week has this interesting story of a zombie fungus attacking our leatherwings.
"A fungal pathogen called Entomophthora lampyridarum lurks in
the landscape waiting to infect soldier beetles when conditions are right.
After penetrating the surface of the hapless beetle, the fungus takes
control of its host and zombie-fies it.
The fungus causes beetles to march to the upper leaves of the plant,
clamp onto leaves with their jaws, and spread their wings in the final
act of death. This allows fruiting bodies to erupt from the upper
surface of the beetle and spew their spores into the environment where
they disperse and infect other victims. While we lament the loss of
beneficial soldier beetles to their disease, in the greater scheme of
things Entomophthora fungi are highly beneficial causing
epizootics that can decimate nasty pests like gypsy moths, house flies,
and locusts. Some entomologists believe that fungi are the primary
regulatory agents of insect outbreaks worldwide. Glad they infect bugs
and not us. "
Bug of the Week also has this video of mating leatherwings while the female is hard at work, supporting the male, something that my wife can relate to.
More on soldier beetles in general at this
University of Kentucky site.