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Home » Guide » Arthropods (Arthropoda) » Arachnids (Arachnida) » Harvestmen (Opiliones) » Palpatores
Photo#82256
Harvestman - species?
Copyright © 2006 Corynn Hanson

Harvestman - species?
Seattle, King County, Washington, USA
October 8, 2006
Size: 1/4 inch
I know this is a harvestman, but I was wondering how one goes about determining what species. I also don't know how to sex them.

I first found one of these in my sink in late September, but couldn't get a good picture because it was too small. Today I found a couple outside, hiding under a chunk of concrete in the early evening.

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Harvestman - species? Harvestman - species? Harvestman - species?
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Contributed by Corynn Hanson on 8 October, 2006 - 10:00pm
Last updated 19 February, 2009 - 6:37pm

Moved
Moved from Harvestmen.
… Charles Stephen, 19 February, 2009 - 6:37pm login or register to post comments

Probably Phalangiidae
Phalangiidae, I think. It's hard to see the dorsum to look for the extra sclerotization & spiny bits characteristic of this family.

Except for species with sexually dimorphic features it's impossible to tell without looking at their bits, which they conceal under a ventral flap, the 'genital operculum'. Some examples of features you can use are the cheliceral anterior-pointing 'horns' on Phalangium opilio males, distal anteriolateral-pointing triangular projections on Rilaena triangularis males.
… Charles Stephen, 17 February, 2009 - 2:35pm login or register to post comments

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