Hello,
I searched the forums for this but I couldn't find anyone else listing these as tamable and they aren't on the list. - Phantazya
Both of these crabs can be found as random replacements for all the various other Sandshifting Crabs in the water, the shore and near the quest givers on the Siren Isle. I thought I would let others know as I love the colors.
Teal Shell Crabs not listed but tameable from the Siren Isle
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Re: Teal Shell Crabs not listed but tameable from the Siren Isle
Thanks! Looks like we missed that those crabs had more colours added later. They originally only had 5. I'll fix them shortly.
Shaman avatar by Spiritbinder.
Re: Teal Shell Crabs not listed but tameable from the Siren Isle
... it looks like there might be many more unused hermit crab combos present in that species!
Shaman avatar by Spiritbinder.
Re: Teal Shell Crabs not listed but tameable from the Siren Isle
I am glad Blizzard keeps adding more choices for us to tame. 

Re: Teal Shell Crabs not listed but tameable from the Siren Isle
So, it turns out the Sandshifting Hardshell now has 16 unique looks, 15 of which it didn't have before. The originals (other than the one that carried over) were removed from it at some point - presumably before the patch went live but after we last checked. The new looks (all unique to it) include some really gorgeous combos:

I especially love the orange / brown, orange / orange, purple with green spots, and pink with peachy shell.
The one look that carried over from the original was also unique.

One unique look was unfortunately removed and may no longer be available (unless it was stealth added somewhere else):

It seems like someone made a deliberate effort to retain the first unique look so it might be a mistake the other unique one was removed.















I especially love the orange / brown, orange / orange, purple with green spots, and pink with peachy shell.
The one look that carried over from the original was also unique.

One unique look was unfortunately removed and may no longer be available (unless it was stealth added somewhere else):

It seems like someone made a deliberate effort to retain the first unique look so it might be a mistake the other unique one was removed.
Shaman avatar by Spiritbinder.