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Common woodlouse

Oniscus asellus


The woodlouse has a shell-like exoskeleton, which it must progressively shed as it grows. The moult takes place in two stages; the back half is lost first, followed two or three days later by the front. This method of moulting is different from that of most arthropods, which shed their cuticle in a single process. Metabolic rate is temperature-dependent in woodlice. In contrast to mammals and birds, invertebrates are not "self heating": the external environmental temperature relates directly to their rate of respiration.


Though today found worldwide, woodlouse populations in the Americas arrived from Europe by sea alongside humans.


Spotted in my backyard

1 Species ID Suggestions

Common woodlouse
Oniscus asellus Oniscus asellus

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JabariMcNichols 7 years ago

you are welcome

@Thanks ForestDragon,we tried to improved,our "tecnic" is to take many photos to choose after in the computer the bests ;-)
@Thanks Scott for the ID
@Thanks KarenPuracan :-)
@Thanks Maria for your nice comment

ForestDragon 7 years ago

Antonio, beautiful pictures! I think I need a new camera, haha. Mine never turn out so crisp!
I agree that this is a species of Woodlouse. These guys are similar looking to the Pill Bugs but are unable to roll into a ball. They are fairly common under rotting wood and debris.

MrsPbio 7 years ago

Roly-poly! I love playing with them... They roll up into little balls then they scurry away.

Maria dB
Maria dB 7 years ago

Nice series, Antonio!

thanks Hema for you nice comment Jabari for the ID

Hema 7 years ago


Braga, Portugal

Spotted on Dec 28, 2012
Submitted on Jan 14, 2013

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