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Chalcosoma caucasus (page 6)

The pupation cells of C. caucasus.

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Here can be seen a mature 3rd instar larva of C. caucasus constructing the pupation chamber (cell) inside which it will undergo metamorphosis into an adult beetle.  It makes the structure out of surrounding particles of decayed wood and leaves.
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Chalcosoma caucasus larva in pupation cell - Image  C. Campbell

 
Pupation cell of Chalcosoma caucasus - Image  C. Campbell
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A pupation cell of a male C. caucasus.  Length - 19 cm (7.5 in.).  The pupal duration of this species is several months, and is rather variable in time frame, with some individuals taking longer than others to emerge.  Typically, females emerge faster than males.
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Another pupation cell, this time left inside the rearing terrarium.  The ruler pictured is 12 inches long (30.5 cm), and the cell measures about 17 cm (6.75 in.).
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Pupation cell of Chalcosoma caucasus - Image  C. Campbell

 
Female Chalcosoma caucasus in pupation cell - Image  C. Campbell
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A newly emerged female inside her pupation cell.  These beetles remain inside their cells for at least a few weeks following emergence from the pupal skin.  During this time, their exoskeletons harden and darken.  By the time the insect breaks free of the cell, its body will be completely solidified and ready to face the world outside.  There is a time during emergence from the pupal phase when the actual flight wings are visible, but they are neatly folded under the elytra prior to leaving the cell.
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