Help identifying a few hitchhikers please

[Kimmimcgilli]

Hi
Could I get some help identifying these 3 hitchhikers please? I think one of them is a Black Sea cucumber but I'm struggling with the crab.
The shell closes when I shone a torch on it. Clam? Mussel? Please help. I desperately don't want anything to destroy my tank inhabitants

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[monkeysee1]

Looks like a harmless little guy (crab) in the first picture. Kind of hard to tell though.
Please don't kill it. Probably beneficial!

 

[Kimmimcgilli]

Looks like a harmless little guy (crab) in the first picture. Kind of hard to tell though.

Please don't kill it. Probably beneficial!

Any idea what breed of crab? At my LFS 1 guy thought it was a mithrax but another guy said mithrax don't have dark pincers. Rest easy, I'm no crab killer [emoji1]


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[Tripod1404]

Any idea what breed of crab? At my LFS 1 guy thought it was a mithrax but another guy said mithrax don't have dark pincers. Rest easy, I'm no crab killer [emoji1]


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That is a gorilla crab. Move it to sump.

 

[Kimmimcgilli]

That is a gorilla crab. Move it to sump.

Wowwweee! Gorilla definitely doesn't sound good!! Thanks for your help and advice. I'll do some reading up and move him [emoji1303]


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[monkeysee1]

Maybe I stand corrected then - IF in fact it IS a gorilla crab! Again, the picture is kind of fuzzy. May want to be safe than sorry.
I apologize.

 

[Kimmimcgilli]

Maybe I stand corrected then - IF in fact it IS a gorilla crab! Again, the picture is kind of fuzzy. May want to be safe than sorry.
I apologize.

All help is appreciated. Thanks for taking the time to reply, both of you.


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[liverock]

That is a gorilla crab. Move it to sump.

Bingo

 

[Kimmimcgilli]

Thanks all for your help.

Now the crab has been identified any ideas on the shell please?


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[Tripod1404]

In my opinion, the black thing is a sponge (unless it is mobile). The shelled thing in the 3rd picture is some type of bivalvia. It's hard to tell the exact species but it looks more like a mussel than clam. in either case, both are safe.

 

[Kimmimcgilli]

In my opinion, the black thing is a sponge (unless it is mobile). The shelled thing in the 3rd picture is some type of bivalvia. It's hard to tell the exact species but it looks more like a mussel than clam. in either case, both are safe.

Tripod you are fabulous, thanks!
The black thing has moved in the past. It looked like a fat worm with knobbly bits along its body. Got itself in a hole in the rock halfway up the tank and stays there. It has these tentacle type bits that it curls into its body when it's feeding time so I'm guessing it's feeding and happy. It may come out at night but who knows.
I think I'm missing a hermit crab and the gorilla is the first culprit. It's sump time for him.
Thanks again


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