» Horseshoe Crab    Information on this benthic crab, Limulus polyphemus, its life cycle, habitat and its commercial harvest, primarily for bait.    http://www.chesapeakebay.net/horseshoe_crab.htm

» Horseshoe Crabs: The Ancient Mariner    Information on these crabs, which have evolved little in the last 250 million years, their behavior and mating ritual.    http://www.beach-net.com/horseshoe/Bayhorsecrab.html

» Limulus polyphemus    Exercise from Invertebrate Anatomy OnLine covering the systematics, natural history, external and internal anatomy and trilobite larva of this horseshoe crab.    http://webs.lander.edu/rsfox/invertebrates/limulus.html

» Merostomata    Brief description of the class, from the Animal Diversity Web.    http://animaldiversity.ummz.umich.edu/arthropoda/merostomata.html

» The Amazing Horseshoe    Information on these crabs, family Limulidae, their anatomy, life cycle, ecological niche, spawning and medical uses.    http://www.horseshoecrab.org/nh/hist.html

» The Horseshoe Crab - Limulus polyphemus    Brief profile of species biology and ongoing research, with a photo.    http://marylandfisheries.fws.gov/horseshoe_crab.htm