Student Project Figures Figure 3 Symbology from Messing (2017), showing notation of the ossicles present in the feather star (comatulid) theca and rays. Color symbology is as follows: radial ossicle (red); primibrach series (dark blue); secundibrach series (light blue); tertibrach series (green); tetrabrach series (yellow); unbranched arms (pink); cirri (white); centrodorsal (yellow).  Figure 1 Figure 2 Figure 3