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Adult female 5.5mm. This is one of the known color forms of this spider. It is extremely similar to a common color form of Mecaphesa dubia. One difference that I have found is that Mecaphesa celer that have red on them also have two pairs of dark spots on the anterior dorsal abdomen, with the anterior-most pair wider than the poster pair. If it has red and looks like this but does not have these spots, it's more likely to be Mecaphesa dubia. I believe Mecaphesa celer females are more commonly all yellow.