First bug-waterfall

Went to photograph the waves, found a short trail to a waterfall, a branch with MOSS spotted on the bent to picture moss, and this little guy popped up and was sitting on rock where I lay, for me to these pictures! Any help is appreciated! Anyone what this is? It can swim and has long tentacles and spikes on the tail.P1) Salmon Creek waterfall/PPIMG border=”0″ alt=”” src=”http://www.photo-natural.com/wp-content/uploads/2014/01/wpid-1401piedrablancas0061-80-X2.jpg”/PP2) full size/PPIMG border=”0″ alt=”” src=”http://www.photo-natural.com/wp-content/uploads/2014/01/wpid-1401piedrablancas0061-103-X2.jpg”/PP3) close-up/PPIMG border=”0″ alt=”” src=”http://www.photo-natural.com/wp-content/uploads/2014/01/wpid-1401piedrablancas0061-101-X2.jpg”/PP4) Mini tentacles/PPIMG border=”0″ alt=”” src=”http://www.photo-natural.com/wp-content/uploads/2014/01/wpid-1401piedrablancas0061-105-X2.jpg” /P
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