  |
Horseshoe Crabs: The Ancient Mariner - http://www.beach-net.com/horseshoe/Bayhorsecrab.html
Information on these crabs, which have evolved little in the last 250 million years, their behavior and mating ritual. |
  |
The Amazing Horseshoe - http://www.horseshoecrab.org/nh/hist.html
Information on these crabs, family Limulidae, their anatomy, life cycle, ecological niche, spawning and medical uses. |
  |
Horseshoe Crab - http://www.assateague.com/horsesho.html
Photographs and information on the biology and mating behavior of these creatures which are not closely related to true crabs. |
  |
The Horseshoe Crab - Limulus polyphemus - http://www.horseshoecrab.org/
Promotes public awareness of the four remaining species. Natural history, conservation, medical uses, education, sightings, stories, images, glossary, and bibliography. |
  |
Merostomata - http://animaldiversity.ummz.umich.edu/arthropoda/merostomata.html
Brief description of the class, from the Animal Diversity Web. |