1. Slow moving sea spiders are common, sometimes growing as large as a human hand. 2. The genus was named after the marine biologist and sea spider specialist Joel Hedgpeth. 3. It contains the horseshoe crabs, sea spiders , and arachnids ( including scorpions and spiders ). 4. "' Nymphonidae "'is a family of sea spiders which has representatives in all the oceans. 5. These sea spiders can be found in deep-sea. 6. ""'Nymphon leptocheles " "'is a species of sea spider first described by Georg Ossian Sars in 1888. 7. ""'Nymphon gracile " "'is a species of sea spider first described by William Elford Leach in 1863. 8. Sea spiders are generally predators or scavengers.9. The extant chelicerates comprise two marine groups : sea spiders and horseshoe crabs, and the terrestrial arachnids. 10. A partial genome of a flavivirus has been found in the sea spider " Endeis spinosa ".