Crab Spider / Philodromus rufus
This is a running crab spider - technically a member of the Philodromidae family of spiders. These are found pretty much everywhere in the world.
We believe that more specifically it is a type of crab spider called a Philodromus rufus from what we can tell! I call this a "tick spider" because its body looks tick-like to me. It's much more friendly than a tick, though!
It is less than an inch in diameter. It was found on our back porch in Sutton.
Apparently the reason spiders have those "dimples" on their backs has to do with their internal organs. They don't have a skeleton. The way organs are held in place are with thin "guy wires" which attach to various parts of their body and then support the organs. So those dimples are one of the internal attachment points for a wire, that is holding up an internal organ.
Another one, taken in a different year!
More Running Crab Spider Photos
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Spiders in Sutton Massachusetts
Animals and Birds in Sutton Massachusetts
Sutton Massachusetts Photo Collection