@article {2943,
	title = {Morphological variation in the horsehoe crab <i>Limulus polyphemus</i>},
	journal = {EvolutionEvolution},
	volume = {35},
	number = {4},
	year = {1981},
	pages = {647-658},
	isbn = {0014-3820},
	author = {Riska, B.}
}
@article {2830,
	title = {A speciational history of" living fossils": molecular evolutionary patterns in horseshoe crabs},
	journal = {EvolutionEvolution},
	year = {1994},
	pages = {1986-2001},
	isbn = {0014-3820},
	author = {Avise, John C and Nelson, William S and Sugita, Hiroaki}
}
