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Temporal range: 244–0 Ma
L polyphemus L darwini.png
Modern L. polyphemus compared to the very similar Jurassic L. darwini
Scientific classification e
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Merostomata
Order: Xiphosura
Family: Limulidae
Genus: Limulus
O. F. Müller, 1785
Type species
Limulus polyphemus
  • Xiphosura

Limulus is a genus of horseshoe crab, with one extant species, the Atlantic horseshoe crab (Limulus polyphemus). Many fossil species are known, many of which have since been assigned to other genera.[1]

Currently valid species include:[2]

Doubtful species include:[2]

Tentative species:[2]


  1. ^ S., Leif (1952). "Phylogeny and Taxonomy of Fossil Horseshoe Crabs". Journal of Paleontology. SEPM Society for Sedimentary Geology. 26 (4): 630–640. JSTOR 1299851. 
  2. ^ a b c d Dunlop, J. A., Penney, D. & Jekel, D. 2013. A summary list of fossil spiders and their relatives. In Platnick, N. I. (ed.) The world spider catalog, version 14.0 American Museum of Natural History, online at
  3. ^ Kin, Adrian; Błażejowski, Błażej (2014). "The Horseshoe Crab of the Genus Limulus: Living Fossil or Stabilomorph?". PLoS ONE. 9 (10): e108036. doi:10.1371/journal.pone.0108036. PMC 4183490Freely accessible. PMID 25275563.