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I found these crabs at the end of September, 2018. My family was vacationing on the coast of Lopez Island in the Pacific Ocean off of Washington State. I have been trying to figure out what they are ever since. I found two crabs, one that was orange and black, and another that was off-white and black. They are both about an inch and a half across and an inch from front to back. I did some research and the closest thing I could find are oyster crabs, which are found inside oysters on the East Coast of North America. (I found my information on oyster crabs here). However, I found these inside clams on the West Coast. Also, the pictures of oyster crabs I can find online (figure 1) do not look like my oyster crabs. I was wondering if anyone can identify these crabs. Sorry about the picture quality and thanks in advance!

A picture of an oyster crab I found online [Figure 1: A picture of an oyster crab that I found online. There are not very many pictures of oyster crabs online, and they all look similar to this one.]

Two supposed oyster crabs [Figure 2: The back of the two supposed oyster crabs I found. They are not fighting, I just put them close together for the picture.]

The front of one supposed oyster crab [Figure 3: The front of the off-white supposed oyster crab. In the picture, you can see its tiny eyes and small mouth, along with the claws.]

The front of another supposed oyster crab [Figure 4: The front of the orange supposed oyster crab. In the picture, you can see its tiny eyes, small mouth, and claws.]

The back of the orange supposed oyster crab [Figure 5: The back of the orange supposed oyster crab.]

The back of the off-white supposed oyster crab [Figure 6: The back of the off-white supposed oyster crab.]

The undersides of the supposed oyster crabs [Figure 7: The undersides of the two supposed oyster crabs. As you can see, they both have eight legs and two claws, making them crabs and part of the crustacean family.]

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  • $\begingroup$ Hi welcome to Bio.SE! Could you add a note or caption clarifying which pictures represent your specimens and which are online comparisons? I believe just your top one comes from a source other than your own, but I think captions would make this crystal clear. Thanks! $\endgroup$ – theforestecologist Feb 12 at 4:37
  • $\begingroup$ I want to say... so cute. $\endgroup$ – user22542 Feb 12 at 17:01
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    $\begingroup$ Thanks for the advice! I’ll definitely add some captions. And I totally agree. They are really cute! $\endgroup$ – J. Stanford Feb 12 at 17:56
  • $\begingroup$ Upvoted for the clear photos! $\endgroup$ – iayork Feb 12 at 20:16

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