However, the auricularia, but not bipinnaria, also develops a simple skelotogenic cell lineage.
McCauley Brenna S, Wright Erin P, Exner Cameron, Kitazawa Chisato, Hinman VeronicaF 2012, 'Development of an embryonic skeletogenic mesenchyme lineage in a sea cucumber revealsthe trajectory of change for the evolution of novel structures in echinoderms', EvoDevohttp://www.evodevojournal.com/content/3/1/17. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)