Ghost Shrimp Types

[Hmongol]

So I got about 3 ghost shrimp in my 10 gallon with some tetras and somewhere on the internet many folks claim that some petstore can accidently give you a more aggressive and carnivore type that looks like a ghost shrimp. If this happen those shrimp can actually kill and eat your fish... I've searched online for different type but I can't seem to find a decent information on this.
Can someone help tell me the different carnivorous species that could be mistake for a ghost shrimp when purchased. If possible what are the types and names of ghost shrimp that do eat or try to eat fish that way I can compare it to the ones I recently bought (if possible photos). Thank you

 

[dunnm]

From my limited experience there is no way to tell until they grow. I bought two batches(different LFSs) - one batch grew very long pincers and in our community tank quickly became a centre piece for the kids. Our tank is 75% covered in Amazon frogbit but the shrimps never had any interest until we added hatchets !!!!! Then they went crazy - the long pincered beasts quickly (within seconds) pounced. Of the eight hatchets only four survived the stress - all partially eaten(perhaps my fault - wanted to show the wife the agression and it took me ages to catch the B********, they were relentless in their attacks) BUT prior to that nothing against the Tetras & Corys perhaps relise cant catch a mid swimmer or a toughie ?