The carpus of pereopod 2 is subdivided by many annular striations into a flexible series of many articles. This structure is called a multiarticulated carpus. Pandalids have many articles (more than 7) on the carpus of the 2nd pereopod, and usually have around 20.
Pandalus platyceros has a long rostrum which is longer than the rest of the carapace. It has movable dorsal spines which continue out to at least part of the distal half of the rostrum.
Abdominal segment 3 has no mid-dorsal carina (ridge) or spine. Note how the pleurite of segment 2 expands and overlaps that of segments 1 and 3, as is characteristic of caridean (true) shrimp.
This scar on the abdomen is the result of the outgrowth of the externa of the parasitic barnacle Sylon hippolytes. Photo provided by Hilary Wood of the Alaska Dept. of Fish and Game.
