Scientists
at the University of Montreal have discovered a type of larva that turns
ladybird beetles into the living dead of sorts, using them for food and shelter
in the process.
The
larvae of the Dinocampus coccineilae parasitic wasp colonize and consume the ladybugs
while they are still alive, the scientists observed. The larva is laid as an
egg in the soft interior ofthe ladybug, where it can grow without beng
disturbed by its natural predators. After some 20 days, the larva breaks out
ofthe ladybug's body and spins a cocoonbetween the beet|e's legs.This
nearly paralyzes the ladybug so that it can barely move and has no choice but
to protect the pupa—stage wasp with its body.
The
larva continues to feed on the ladybug, and it is able to survive the feeding.
The larva benefits from its host's life up to the very last minute:The living
ladybug occasionally jerks, which is likely enough movement to keep the |arva’s
enemies at bay. When the larva is ready to leave the pupa, it releases its
host, which — to the scientists‘ surprise — sometimes has sufficient energy to
resume its pre-occupation life; this phenomenon was observed in 25 percent of
cases.
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