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220 Views 2 Replies Last post: Jul 11, 2013 11:22 AM by blueb4sunrise RSS
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Jul 11, 2013 9:40 AM

Ground Beetle

we found a nice big black ground beetle but we are not sure exactly what kind.

 

It had a very swollen abdomen which was bulging out behind the elytra. 

 

Why would the abdomen be swollen like this?

any body help with a positive ID on this beetle?

 

 

It was aproximately 20mm long, I'm in the North east of Scotland.

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    Jul 11, 2013 10:42 AM (in response to blueb4sunrise)
    Re: Ground Beetle

    The beetle looks like Pterostichus niger and the non-swollen front tarsae (segments of the 'foot') makes it a female - so her abdomen is probably swollen for good reason. This is the look that a lot of beetles have when they are 'gravid' and full of eggs - its the right season too, so that would be my somewhat informed opinion. Other hypotheses would include parasites, an internal nematomorph worm (Nematomorpha) perhaps .... but I still favour that she is simply 'pregnant'.

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