Limulus is a genus of horseshoe crab, with one extant species, the Atlantic horseshoe crab. One fossil species is currently assigned to the genus though several other species have been named, which have since been assigned to other genera.

What is Limulus of biology?

Limulus is a taxonomic genus of the family Limulidae, commonly known as horseshoe crabs. Morphologically, the horseshoe crabs look like crabs but they are more closely related to the arachnids. These animals are horseshoe-shaped and with a hard carapace and a spine-like tail. ... Kingdom: Animalia.

What is the meaning of Limulus polyphemus?

Definitions of Limulus polyphemus. large marine arthropod of the Atlantic coast of North America having a domed carapace that is shaped like a horseshoe and a stiff pointed tail; a living fossil related to the wood louse. synonyms: Xiphosurus polyphemus, horseshoe crab, king crab. type of: arthropod.