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- The most important taxonomic character in eurypterids is the morphology of the sixth pair of appendages. In most eurypterids of the suborder Eurypterina, such as Bassipterus , this leg is modified into a swimming paddle. In eurypterids of the suborder Stylonurina, such as Parastylonurus , it is not. (en)
- Eurypterids have historically been seen as closely related to xiphosurans such as the Atlantic horseshoe crab , united in the class Merostomata. Recent studies are in favor of a closer relationship to arachnids such as Heterophrynus , united under the clade Sclerophorata. (en)
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