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small carabid - Elaphropus parvulus

small carabid - Elaphropus parvulus
Groton, Middlesex County, Massachusetts, USA
March 6, 2011
Size: 1.9mm
Found under a rock in a sandy area.

Elaphropus parvulus
based on my microscopic examination of this specimen which is now a photo-voucher in the P.W.Messer collection. Thanks Tom.

A really exciting find because this species, introduced from Europe, had been known only in our western regions: BC, ID, OR, WA.

This species is distinguished from other Elaphropus in North America by the complete 8th elytral stria. The five well impressed punctate striae on each dorsal elytron also helps.

LaBonte (1998) discusses the natural history and North American distribution of Elaphropus parvulus in Coleop Bull. 52(1): 35- 42. I noticed a couple of internet imgaes that fit well Tom's specimen.

European import
That's quite a range extension, from the west coast to the east. Or maybe they accidentally were introduced in the east also.

It's just a matter of time
for European imports to hit both coasts, That could occur via slow internal migration or by subsequent (accidental) introduction to the other coast.

Significant range extension of an *introduced* species
is especially important information to communicate to the scientific & ecological communities. Tom, it would be useful to capture more E. parvulus in your area that could provide a series for publication.

I'll see if I can find more
The location is only 1/4 mile from my house.

Moved from Ground Beetles.
Peter, I'll save this and any other carabids that look interesting again this year for you. It's always great getting a possitive id to go along with the picture.

subtribe Tachyina
which contains genera Tachyta, Paratachys, others. Tom, I would be happy to pass this one through keys if you plan on assembling another unknown carabid batch for this year. Thanks.

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