Limulus

Limulus; Temporal range: 244–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Modern L. polyphemus compared to the very similar Jurassic L. darwini
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Order:	Xiphosura
Family:	Limulidae
Genus:	Limulus; O. F. Müller, 1785
Type species
	Limulus polyphemus; (Linnaeus, 1758)
Synonyms
	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]

Limulus polyphemus (Linnaeus, 1758)
Limulus coffini† Reeside & Harris, 1952- Cretaceous, United States
Limulus darwini† Kin & Błażejowski, 2014- Jurassic, Poland[3]
Limulus priscus† Münster, 1839- Triassic, Germany
Limulus woodwardi† Watson, 1909- Jurassic, England

Doubtful species include:[2]

Limulus nathorsti† Jackson, 1906- Jurassic, Sweden

Tentative species:[2]

"Limulus" decheni† Zinken, 1862- Paleogene, Germany (considered by some intermediate between Limulus and Tachypleus)[2]

References

S., Leif (1952). "Phylogeny and Taxonomy of Fossil Horseshoe Crabs". Journal of Paleontology. SEPM Society for Sedimentary Geology. 26 (4): 630–640. JSTOR 1299851.
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 http://research.amnh.org/entomology/spiders/catalog/index.html
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 4183490. PMID 25275563.

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[Pleaseexpand-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.

[fossils-2] 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 http://research.amnh.org/entomology/spiders/catalog/index.html

[K&B2014-3] 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 4183490. PMID 25275563.