I'm unsure of which species. I think there are three different choices (unsure about Libinia erinacea) that it could be. It may be a Juvenile Seagrass Spider Crab because it said that the rostrum is more forked deeply as juvenile, but I didn't see a good picture of this crab.
Here's another link to look at as well for comparison.
http://txmarspecies.tamug.edu/invertdetails.cfm?scinameID=Libinia%20dubia
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