Well, there are similar Lysmata species (where the peppermints are placed), as well as a completely different shrimp in the genus Rhynchocinetes (otherwise known as "camel" or, more accurately, "hingebeak" shrimp). The difference between these two is rather obvious, with the latter having white stripes. Other Rhynchocinetes species are less obvious, except for the fact that their rostrum (snout, nose, beak, or whatever you'd like to call it), like all members of the genus, is literally hinged. They can flex it up and down and tend to do so almost continually. As for different Lysmata species, it comes down to the stripe patterning. The look alikes will often be called "Pacific peppermint shrimp," so avoid those. Though they are related, they aren't peppermint shrimp (Lysmata wurdemanni) and are a temperate species, Lysmata californica. Google these last two to find the different images and the contrast in the stripe pattern.
