Even though I’m nominally an expert in crustaceans, I’m embarrassed by how little I know about them. If I was walking down a beach and saw this little guy, I would recognize it as Emerita – which I should, since they were one of the species in my doctoral thesis! – but I would be completely oblivious to this being a new species.
I might, and I stress might, clue into to the colour. The blue patch at the front around the eyes is something that is different than in other mole crabs, but it’s still quite subtle.
Of course, I’m unlikely to spot this walking down a beach, since its name, Emerita taiwanensis, indicates where it’s from: Taiwan. They’ve been found only at two locations, and only once from one of those two.
Reference
Hsueh P-W. 2015. A new species of Emerita (Decapoda, Anomura, Hippidae) from Taiwan, with a key to species of the genus. Crustaceana 88(3): 247-258. http://dx.doi.org/10.1163/15685403-00003413
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