Linked from
The 8 pages that link to Eurypterid, each with the reason it gives.
SilurianRelated: Some eurypterids flourished in Silurian marine and brackish environments.
ChelicerataBroader topic: Eurypterids document the former diversity and size range of chelicerates.
MegarachneNarrower topic: Megarachne belongs to this group, not to spiders.
EurypterusNarrower topic: Eurypterus is one genus within this broader fossil group.