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Oniscus asellus - Front half moulted Woodlice keep growing all their life, long after reaching sexual maturity, and (for that) keep on shedding their skin. They do so in two phases: Rear half and front half. This Oniscus asellus has just shedded the front half. Isopoda,Oniscidae,Oniscidea,Oniscus,Oniscus asellus,moulted,teneral Click/tap to enlarge Promoted

Oniscus asellus - Front half moulted

Woodlice keep growing all their life, long after reaching sexual maturity, and (for that) keep on shedding their skin. They do so in two phases: Rear half and front half. This Oniscus asellus has just shedded the front half.

    comments (11)

  1. I've never seen it done in 2 halves, so cool! Is this unique to woodlice? Posted one month ago
    1. Hi Ferdy, well ... I only know this moulting in two halfs for Woodlice but I don't know everything (not even a whole lot really, come to think of it ... I don't even know for sure if water dwelling Isopods do this too?!?) Posted one month ago
      1. Nice! I took a photo of one last month with the back half molted:
        Common Woodlouse (Molted) - Oniscus asellus Back half freshly molted.<br />
<br />
Habitat: Under rotting wood Geotagged,Oniscus asellus,Spring,United States,oniscus,woodlouse
        Posted one month ago
        1. Nice, now we have a match! Posted one month ago
        2. Yes,excellent. The rear half normally comes first and when the old exoskeleton is stripped off the teneral innards are able to expand and have a "growth spurt", resulting in these odd creatures with a very phat booty until the front half has moulted too and things get back to normal :o) Posted one month ago
          1. Oh, neat! Fat booty, indeed ;P Posted one month ago
  2. Awesome new adds!
    Great work*
    Posted one month ago
    1. Thanks Rui, the woodlice are all spin-off of some other project I worked on over the last week. Lots of old, low quality pictures, but hey .... Posted one month ago
      1. My new philosophy is this, there’s no such thing as “quality” there are only great records and awesome findings, such this ones you’ve shared* Posted one month ago
        1. Thanks Rui -I'll be pestering JD with more quite mediocre images of good records and findings of woodlice in the time to come :o) Posted one month ago
          1. Your photographs are great my friend!
            I have also a beautiful woodlice from recent findings, I'll share here after posting on JD.
            I really don't have any experience on Isopoda, neither a good key for european isopoda, for starters :o)
            I'll share it here:
            Porcellio echinatus - Female Top view<br />
Found under rotten Pinus sp tree bark<br />
 Animalia,Arthropoda,Isopoda,Malacostraca,Oniscidea,Porcellio echinatus,Porcellionidae,biodiversity

            Thanks so much, Arp!
            Most grateful,
            cheers!
            Posted one month ago, modified one month ago

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''Oniscus asellus'', the common woodlouse, is one of the largest and most common species of woodlouse in the British Isles and Western and Northern Europe, growing to lengths of 16 mm and widths of 6 mm.

Similar species: Brood Pouch Crustaceans
Species identified by Pudding4brains
View Pudding4brains's profile

By Pudding4brains

Public Domain
Uploaded Jun 12, 2019.