Atypical Snapping (Pistol) Shrimp ID please?

[Myka]

I bought a couple shrimp imported as Alpheus bellulus, Tiger Snapping Shrimp. I didn't notice at first that they are not Tigers. Now it is obvious to me that they must be something different - possibly they are simply species variants of Tigers?? I found a pic that is the same as them, take note of the remarkably blue legs with yellowish bands at each "knuckle" join on the legs. The tail area is also remarkably bluish grey rather than typical brown shades of Tigers. I've been trying to look up images of the fish pictured, Cryptocentrus cinctus and hoping this particular shrimp variant will show up with a name, but no luck. Looks like this goby often/usually pairs up with Alpheus bellulus. Go figure. :D

 

[bios]

That's seem an alpheus rapax :)

 

[Myka]

That's seem an alpheus rapax :)

I can't find hardly any info or pics of this one! Do you know where there is some info? I'm mostly concerned if this species will pose a threat to fish or invertebrates.

Sorry, I should have included before that this shrimp came from Philippines.

 

[bios]

Alpheus rapax is the only I know with blue leg banded yellow
https://goo.gl/images/mlKw7K
Some are from Egypt more blue also the body
Ones from indonesia, Philippine is more brown the body as yours
Both have blue leg banded yellow

 

[Myka]

Alpheus rapax is the only I know with blue leg banded yellow
https://goo.gl/images/mlKw7K
Some are from Egypt more blue also the body
Ones from indonesia, Philippine is more brown the body as yours
Both have blue leg banded yellow

The tail/abdomen patterning is much different in that photo. Interesting about the blue. I did think it was quite striking. Not sure why I didn't notice when I bought them.

 

[bios]

https://www.researchgate.net/public...pheus_rapax_Fabricius_1798_Decapoda_Alpheidae
Something more

 

[Myka]

https://www.researchgate.net/public...pheus_rapax_Fabricius_1798_Decapoda_Alpheidae
Something more

Ah, I saw that one, but didn't read it. I see there is a photo in there. I'm not sure my shrimp are rapax - the abdomen looks much different. Rapax the abdomen is kind of a mottled pattern where mine have very distinct bands like the one in my picture above. What do you think?

 

[Myka]

https://www.researchgate.net/public...pheus_rapax_Fabricius_1798_Decapoda_Alpheidae
Something more

Reading it now, I see this comment:

"It is worthwhile to note, although beyond the scope of this study, that the
taxonomy of several species groups within the genus Alpheus is still in flux; A.
rapax is a species complex and will require a thorough revision in the future (A.
Anker, pers. commun.)."

Maybe my shrimps are in this complex, but not rapax itself. :)