Brief description of the class, from the Animal Diversity Web.
http://animaldiversity.ummz.umich.edu/arthropoda/merostomata.htmlPromotes public awareness of the four remaining species. Natural history, conservation, medical uses, education, sightings, stories, images, glossary, and bibliography.
http://www.horseshoecrab.org/Brief profile of species biology and ongoing research, with a photo.
http://marylandfisheries.fws.gov/horseshoe_crab.htm