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Home » Guide » Arthropods (Arthropoda) » Crustaceans (Crustacea) » Malacostracans (Malacostraca) » Marsupial Crustaceans (Peracarida) » Isopods (Isopoda) » Scutocoxifera » Woodlice (Oniscidea) » Diplocheta » Seaslaters and Rockslaters (Ligiidae) » Ligidium » Ligidium gracile
Photo#246102
Unidentified Isopoda (Woodlouse/Pillbug) - Ligidium gracile
Copyright © 2008 Mark Leppin

Unidentified Isopoda (Woodlouse/Pillbug) - Ligidium gracile
Silver Falls State Park, near Stayton, Marion County, Oregon, USA
December 13, 2008
Size: ~5mm

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Unidentified Isopoda (Woodlouse/Pillbug) - Ligidium gracile Unidentified Isopoda (Woodlouse/Pillbug) - Ligidium gracile
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Contributed by Mark Leppin on 24 December, 2008 - 2:07pm
Last updated 3 July, 2015 - 8:53am

Moved
Moved from Ligidium.
… Eric C. Maxwell, 3 July, 2015 - 8:53am login or register to post comments

Moved
Moved from Malacostracans.
… john and jane balaban, 22 March, 2009 - 5:34pm login or register to post comments

Ligidium
Hi! This is a Ligidium sp. from the family Ligiidae. One good mark that helps in identification:

Ligiidae (e.g. Ligia, Ligidium) species have many ocelli in the eye, while Trichoniscus sp. have only three.

You don't obviously see the ocelli, but the AREA of the eyes tells a lot. When they cover a considerable area on the head (like here), one can assume it's MORE than three.


Three ocelli are almost not visible, you see only a little black dot on the head.
… Ferenc Vilisics, 12 March, 2009 - 3:28am login or register to post comments

 
Sweet!
Very nice, both of you! They are very similar and I wouldn't have been able to find the right genus or family. I was almost sure the pygmy was correct and until you mentioned the eye size & ocelli, I didn't see the difference. Thank you very much
… Mark Leppin, 18 March, 2009 - 2:13pm login or register to post comments

Pygmy
This is what I would call a 'pygmy' woodlouse, family Trichoniscidae.
However, I cannot be 100% sure, so you'll need the word of someone else to verify this.
http://bugguide.net/node/view/55260/bgpage
… Jonas Insinga, 25 December, 2008 - 5:08pm login or register to post comments

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