Diploperculata
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Diploperculata is an infraorder of eurypterids, an extinct group of aquatic arthropods commonly known as "sea scorpions". The name, derived from Greek διπλόω and operculum, refers to the distinguishin
Jaekelopterus rhenaniae reconstruction
Eurypterina
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Eurypterina is one of two suborders of eurypterids, an extinct group of chelicerate arthropods commonly known as "sea scorpions". Eurypterine eurypterids are sometimes informally known as "swimming eu
Diploperculata
…feature that unites the superfamilies included in the group, that the genital operculum is made up of two fused segments. The group contains the three eurypterine superfamilies Carcinosomatoidea, Adelophthalmoidea and Pterygotioidea alongside the as of yet undescribed "waeringopteroid" clade. The diploperculate…
Life restoration of Eurypterus. Eurypterus is by far the most well-studied and well-known eurypterid and its fossil specimens probably represent more than 90 % of all known eurypterid specimens.
Fossil of Mixopterus, a mixopterid.
Fossil of Jaekelopterus, a pterygotioid. At a length of 2.5 meters, it is one of the largest arthropods to have ever lived.