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Rhagium inquisitor in pupal cradle Rhagium inquisitor in pupal cradle found under bark of rotting log Cerambycidae,Coleoptera,Lepturinae,Longhorn beetle,Rhagium,Rhagium inquisitor,pupal cradle Click/tap to enlarge Species introCountry intro

Rhagium inquisitor in pupal cradle

Rhagium inquisitor in pupal cradle found under bark of rotting log

    comments (6)

  1. Cool! What is this circle-like shape? Posted 2 years ago
    1. That is the " pupal cradle" (Dutch: Poppenwieg). Imagine that what you're looking at is after lifting up a loose piece of bark (so the cradle/beetle would be covered directly by the bark top-side. The cradle is created by the larva when it's getting good and ready to pupate. Many beetle larvae living under bark create similar hollow spaces for the pupa to rest in. It provides a bit of protection, but also space for the beetle to emerge from the pupa when ready. The teneral beetle will sit in the cradle until hardened (again - protection for the soft teneral beetle) and usually much longer until "the time is right" (temperature and what have you) to emerge and go find a mate. Posted 2 years ago
      1. Thanks! And how is this circle created? Posted 2 years ago
        1. That is not easily observed ofcourse, but I imagine in this case the beetle larva knaws loose the fibers (you can more or less see that these must have come from the bottom/floor of the cradle - outside the cradle the surface of the tree is higher and quite smooth). Next the larva wiggles it's tail to move the fibers to the side. Something along those lines anyway. Knawing off the fibers is no problem for the larva as it actually feeds on wood(fiber) eating away corridors in the wood and under the bark. Some longhorn beetle larvae are known to tear down wooden buildings this way (not this one) ;o)
          I' ll try and upload some pix of larvae next time I' m home ...
          Posted 2 years ago, modified 2 years ago
          1. Thanks! I'm well aware of the hunger for wood of some beetles, a few years back one settled in our garden shed and managed to eat some very long tunnels in some of the softer woods inside. If you would stand next to the shed, you could actually hear it eating, that's how we found out :) Posted 2 years ago
            1. Here is a series of a larva of R. inquisitor I found in a pupal cradle (not the same individual as the image above):
              Rhagium inquisitor larva in pupal cradle Here is the larva of Rhagium inquisitor in its pupal cradle, that I took home to determine the species by letting it emerge.<br />
Another posture of the same larva is here:<br />
https://www.jungledragon.com/image/50713/rhagium_inquisitor_larva.html<br />
The emerged beetle is here:<br />
https://www.jungledragon.com/image/50714/rhagium_inquisitor_from_larva.html Cerambycidae,Coleoptera,Lepturinae,Longhorn beetle,Rhagium,Rhagium inquisitor,larva,pupal cradle

              Yes, I once spent the better part of an afternoon determining what wooden boards in a stock of boards for building were making those horrible noises :o) Still have the two larvae I found in those boards somewhere, but never got around to determining the species....
              Posted 2 years ago

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''Rhagium inquisitor'' is a species of beetle in the family Cerambycidae. It was described by Linnaeus in 1758.

Similar species: Beetles
Species identified by Pudding4brains
View Pudding4brains's profile

By Pudding4brains

Public Domain
Uploaded May 27, 2017.