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The arrow goby, Clevelandia ios, hatches over estuarine mud flats and remains entrained in shallow water until after caudal fin formation, when schooling behavior commences in the extreme nearshore.All larval stages are illustrated.Settlement is preceded by fusion of the pelvic fins and coincides with pigment pattern development, whereas burrow entry correlates most closely with completion of pigment pattern development.Laboratory tests indicate an experience component to latency times in burrow entry.Juveniles prefer sand substrate, but no preference for presence of burrows or ghost shrimp (Callianassa californiensis) in substrates was evident