Katolog > Science > Biology > Flora and Fauna > Animalia > Arthropoda > Merostomata

The Merostomata includes two distinct groups of marine organisms, the eurypterids (an extinct group that lived 200 to 500 million years ago) and the horseshoe crabs. The horseshoe crabs are also an ancient group; only 4 or 5 species (depending on who's counting) exist today.

Links:

The Horseshoe Crab - Limulus polyphemus Promotes public awareness of the four remaining species. Natural history, conservation, medical uses, education, sightings, stories, images, glossary, and bibliography. www.horseshoecrab.org

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

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