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Not 100% sure about this one, but ID based on Bousquet’s (2010) key:
-Size <6 mm
-Mentum sides not very sinuate
-Setae under each 5th tarsomeres
-Posterior angles of pronotum obtuse
-Caught in a Carex/Scirpus wetland

Quite uncommon species in the Northeast according to LeSage & Savard (2018): https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=web&cd=&ved=0CAIQw7AJahcKEwj4vJHrhoX_AhUAAAAAHQAAAAAQAw&url=https%3A%2F%2Fstatic1.squarespace.com%2Fstatic%2F5731421e07eaa0ea485cadae%2Ft%2F5e97cd3b1d366e1fec0c5b41%2F1587006782406%2FFABRERIES_2018oct.pdf&psig=AOvVaw0ptptTm7F6krdKxeqACjXM&ust=1684711847334685

Along margin of small pond with willows and dense ground cover of sedges.
If you tag as granulatus, please read on.
According to Lindroth:
“Black, upper surface and presternum as a rule pronouncedly metallic, varying from bronze to copper or GREEN. In elytral sculpture it resembles granulatus: three rows of strong tubercles alternating with two unbroken (though + winding) ridges; but the SUTURAL RIDGE IS LACKING. The margin is feebly serrate behind the shoulder (much less so than in serratus), hardly sinuate before apex. The prothorax is more convex than in granulatus, with less flattened sides. The 3 basal antennal segments are COMPRESSED, almost keeled above…”
“A northern but not arctic species with transamerican distribution, though very rare in the west... A rather hygrophilous species, confined to open, + moist ground with rich but moderately high vegetation. Often in Carex bogs.”

Location obscured for privacy. Exact location not given.

Attacking a terrestrial planarian on bank of creek.
The beetle repeatedly bit the planarian, cutting through the worm in different places, before retreating and cleaning off mucus that had covered its mouthparts and front tarsi. Eventually, the beetle cut off the planarian's posterior and began eating this while the rest of the worm escaped.