Came up in one of the samples that I'd dip-netted out of the HAC pond during MIIDGE. Very tiny, almost overlooked it. On the side of my sorting pan, tail pointed toward the surface, head down. My best guess at this point would be a larval Skiff Beetle (Hydroscaphidae)?
PostScript: identified to genus by Matthew Pintar on iNat
Part of the
2020 MIIDGE project.