 The ocelli (light-sensitive simple eyes) were relatively large and placed between the posterior part of the eyes.The postabdominal segments (segments 8 to 12) were longer than the preabdominal segments (segments 1 to 7) and lacking of ornamentation.It had 12-13 gnathobasic (of the gnathobase, a lower appendage used in feeding) teeth in the sixth appendage, as in pterygotids.