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.

enter image description here

  • $\begingroup$ 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. $\endgroup$ Oct 31 '18 at 3:11
  • $\begingroup$ Yes, a leech. I don't know the species, or even family. $\endgroup$
    – Karl Kjer
    Oct 31 '18 at 3:29
  • 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
  • $\begingroup$ Thanks, everyone. Never seen a leech before. I always assumed they were more squishy-looking! $\endgroup$ Nov 14 '18 at 6:17

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