Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371 Author Wicksten, Mary K. text Zootaxa 2012 2012-07-04 3371 1 307 journal article 1175­5334 Key to species of family Chirostylidae 1. Lateral carapace margins strongly convex in posterior 0.66; tergum of abdominal segment 5 unarmed... Gastroptychus iaspis – Lateral carapace margins nearly straight posteriorly; tergum of abdominal segment 5 spiny....... Gastroptychus perarmatus