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Acutiramus is a genus of giant predatory eurypterid, an extinct group of aquatic arthropods.Fossils of Acutiramus have been discovered in deposits of Late Silurian to Early Devonian age.
Fossil chelicera of Acutiramus cummingsi. The massive chelicerae of the pterygotids were their primary distinguishing feature. Left to right, top to bottom: Jaekelopterus rhenaniae, Erettopterus bilobus, Pterygotus anglicus, Acutiramus macrophthalmus, Ciurcopterus ventricosus: Scientific classification; Domain: Eukaryota: Kingdom: Animalia ...
Notably, P. barrandei and P. cobbi occur in marine environments associated with fossils of Acutiramus. P. anglicus is known both from the Old Red Sandstone [38] and the Campbellton formations, [39] both of which are examples of freshwater lake and river systems. [38]
Fossils preserving digestive tracts have been reported from fossils of various eurypterids, among them Carcinosoma, Acutiramus and Eurypterus. Though a potential anal opening has been reported from the telson of a specimen of Buffalopterus , it is more likely that the anus was opened through the thin cuticle between the last segment before the ...
The earliest eurypterid reconstruction; a figure of Eurypterus remipes by James E. De Kay (1825).. This timeline of eurypterid research is a chronologically ordered list of important fossil discoveries, controversies of interpretation, and taxonomic revisions of eurypterids, a group of extinct aquatic arthropods closely related to modern arachnids and horseshoe crabs that lived during the ...
Pterygotioidea (the name deriving from the type genus Pterygotus, meaning "winged one") is a superfamily of eurypterids, an extinct group of aquatic arthropods. Pterygotioids were the most derived members of the infraorder Diploperculata and the sister group of the adelophthalmoid eurypterids.
The closest thing is found contained in the regularly updated Summary list of fossil spiders and their relatives in the World Spider Catalog. The vast majority of the content of the list below, including the valid genera, preoccupied names, junior synonyms, taxonomical classifications and sites of discovery, is based upon the 2018 edition of ...
Based on the isolated fossil remains of a large chelicera (claw) from the Klerf Formation of Germany, J. rhenaniae has been estimated to have reached a size of around 2.3–2.6 metres (7.5–8.5 ft), making it the largest arthropod ever discovered, surpassing other large arthropods such as fellow eurypterids Acutiramus and Pterygotus; the ...