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History
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Mycteropoidea
Mycteropoidea
Fossil of Drepanopterus, the earliest known and most basal mycteropoid.
Fossil of Drepanopterus, the earliest known and most basal mycteropoid.
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Eurypterid
Eurypterid
Illustration of Hibbertopterus, a large stylonurine (lacking swimming paddles) eurypterid
Illustration of Hibbertopterus, a large stylonurine (lacking swimming paddles) eurypterid
The holotype of Palmichnium kosinkiorum, containing the largest eurypterid footprints known
The holotype of Palmichnium kosinkiorum, containing the largest eurypterid footprints known
The supposed "gill tracts" of eurypterids have been compared to the air-breathing pseudotracheae present in the posterior legs of modern isopods, such
The supposed "gill tracts" of eurypterids have been compared to the air-breathing pseudotracheae present in the posterior legs of modern isopods, such as Oniscus (pictured).