This closeup of the carapace shows the short rostrum which extends past the cornea but not past the first article of the first antenna, with 3-6 stout dorsal spines (some on the carapace), a single tip, and no ventral spines, and no supraorbital spine.
This individual shows another color phase. This shrimp has a very strange history and shows that this species is capable of a stygian lifestyle. The shrimp was found living at the bottom of the Rosario Beach Marine Lab seawater reservoir when it was opened for inspection in June 2012. The seawater pumps had been shut off since August 2011. This shrimp and a number of others in the tank must have been sucked through the intake filter screens as larvae in August 2011 at the latest. They would have had to have grown to full size in the underground seawater reservoir through the 10 winter months of 2011-2012, in total darkness and in uncirculated seawater. Presumably they ate debris off the bottom of the tank. The light for this photo is likely some of the first light this shrimp has ever seen. Carapace length for this individual is about 9 mm and total length is 3.5 cm. Photo by Dave Cowles, June 2012
This species has an epipod on pereopods 1-3. This photo shows the coxae at the base of the right pereopods 2 (on the left) to 4 (on the right) The edge of the carapace can be seen above the legs. The flaplike epipod can be seen projecting to the right from the dark part of the coxa of pereopod 2 just above the center of the photo. Photo by Dave Cowles, June 2012.