This was found under a rock in a freshwater creek in Maryland. Stayed like this for while, then stretched out long, then contracted, and then JUMPED off the rock back into the water. Looks like a trilobite. Rock-colored.
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$\begingroup$ well I don't know of any freshwater chitons, so I'm going with a leech. In fact, if by "stretched out long" you mean it literally became long like a ribbon, then this is almost certainly a leech. $\endgroup$ – theforestecologist♦ Oct 31 '18 at 3:11
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$\begingroup$ Yes, a leech. I don't know the species, or even family. $\endgroup$ – Karl Kjer Oct 31 '18 at 3:29
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1$\begingroup$ Very nice image of a leech (probably of family Glossiphoniidae). Please consider sharing a cropped version somewhere like iNaturalist.org $\endgroup$ – mgkrebbs Oct 31 '18 at 18:03
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$\begingroup$ Thanks, everyone. Never seen a leech before. I always assumed they were more squishy-looking! $\endgroup$ – Trail-walker Nov 14 '18 at 6:17
