Biology/Natural History: Live on rocky or sandy/shelly bottoms. Juveniles hide in rock crevices or under algae during the day. Eat polychaetes. The left and right second pereopods are different from one another. The carpus of the left pereopod is divided into about 60 articles, while the right has 18-21. Predators include lingcod and pelagic cormorants. The species are protandrous hermaphrodites (male first, then female). After the female molts in November they mate. The female carries her eggs on the abdomen until April, when they hatch into pelagic larvae. The species can live for up to 3 years.