. . . . . . . . . "Echinoecus pentagonus" . . "Echinothrix calamaris" . . "David R. 2015. Echinoecus pentagonus host Echinothrix calamaris. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/1808810> on 05 Apr 2018." . . . . "http://iNaturalist.org is a place where you can record what you see in nature, meet other nature lovers, and learn about the natural world." .