DescriptionEurypterids Iowa.png English: Discovery sites of the Iowan eurypterids Used images: https://commons.wikimedia.org/wiki/File:Blank_Iowa_county_map.png...
"The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa". BMC Evolutionary Biology...
"The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa". BMC Evolutionary Biology...
Shale arthropod fragments.png English: Eurypterid and other arthropods from the Winneshiek biota. (a–g) The megalograptid eurypterid Pentecopterus decorahensis...
