Unidentified Salamander

[urbpan]

I've been turning over rocks and logs in New England my whole life. I like all the various animals that hide there--isopods, millipedes, centipedes, etc.--but the best is when I find a salamander. 99% of the salamanders I've found have been red-backed salamanders (Plethodon cinereus), though at my job outside of the city I've found both yellow spotted (Ambystoma maculatum) and blue-spotted (A. laterale).

This past Sunday I turned over a log in a swampy part of a park in Boston and found a 10 or twelve individuals of a species of salamander I've never seen before. It was much wetter than places I've found other salamanders--saturated and muddy--and the salamanders writhed away in a rapid slithery way that was new to me.

Does anyone have any ideas what it could be?



(photo by cottonmanifesto)
(cross-posted to herpers)