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TaxonomyBrowseInfoImagesLinksBooksData
Photo#380162
rove beetle - Heterothops fusculus

rove beetle - Heterothops fusculus
Cambridge, Middlesex County, Massachusetts, USA
March 27, 2010
Size: 4.5mm
Found in leaf litter.

Images of this individual: tag all
rove beetle - Heterothops fusculus rove beetle - Heterothops fusculus rove beetle - Heterothops fusculus rove beetle - Heterothops fusculus

Moved
Moved from Heterothops.

Moved

Moved
Moved from Quedius.
Good work getting this dark form identified! Thanks again Adam.

Aha! This is actually Heterot
Aha! This is actually Heterothops, probably fus*culus if the size is correct. I will check details tomorrow, if it is this species, this is the darker morph (compare the other photos on here). Heterothops are best told apart from Quedius by the small size and minute last maxillary palpomere (visible in the third photo).
Will get back to you, thanks for the close-ups

Adam

 
Ok, so it seems the best fit
Ok, so it seems the best fit for this is the darkest form of Heterothops fusculus (less common than orange ones). The eyes look a tiny bit larger than they should be, but I have excluded all other Heterothops AND Quedius species. Note, the scutellum covered in hairs is a very uncommon feature in Quedius and always occurs in Heterothops.
It's great we have the two color extremes of this species in the guide now.
Cheers,
Adam

 
it does indeed
look like anothe Heterothops from Tom here, although that one is H. minor.

 
I just noticed how similar th
I just noticed how similar these look to each other, however Tom's new ones seem to have longer antennomeres and smaller eyes. This genus is very hard from photos and the identification relies best on the punctation of the head and microsculpture of the dorsum. All dark Heterothops on bugguide are too big for anything but fusculus. However, I'm starting to think the size range for H.minor given in the revision is too restrictive and is based on a small range of specimens. H. minor can get up to 4.0mm in the paper but the one I identified earlier is measured at 5mm! Based upon multiple characters, I think perhaps we should move all dark Heterothops to H. minor. Dark H. fusculus can occur but I don't think we have one yet.

Sorry for all the shuffling Tom,
Adam

Hi Tom, this is certainly Que
Hi Tom, this is certainly Quedius, but different from the other one you found earlier. The pale apex of the elytra seems odd to me, if you still have it I'm curious to see what a dorsal shot will show.

-Adam

 
another shot added
I don't know if it gives a good enough view of the head. Should I take another picture?

 
If it's not too much trouble,
If it's not too much trouble, a dorsal shot of the head (to show eye size and punctures) would do much for this one. Looks like subgenus Micro*saurus but I don't remember any having elytra with a pale apex.. hmm..

Adam

 
Close ups added
It looks like it has a very large eye.

Moved
Moved from Rove Beetles.
Quedius looks right. Pretty close to a couple others I found recently.

Quedius sp.
Is my guess; but not 100% confident.

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