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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 ...
Pterygotus is an extinct genus of giant predatory eurypterid, a group of extinct aquatic arthropods.Fossils of Pterygotus have been discovered in deposits ranging in age from Middle Silurian to Late Devonian, and have been referred to several different species.
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 ...
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 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 ...
This is consistent with other pterygotids, such as Acutiramus, and has been interpreted as indicating that adult Jaekelopterus lived in darker environments, such as in deeper water. Trace fossil evidence of eurypterids also supports such a conclusion, indicating that eurypterids migrated to nearshore environments to mate and spawn. [21]
Fossils of Dvulikiaspis have been discovered in Early Devonian deposits of Taymyria in Siberia, Russia. [1] D. menneri has been found alongside specimens of the chasmataspidids Heteroaspis stoermeri and Skrytyaspis andersoni , as well as the possible prosomapod Borchgrevinkium taimyrensis and indeterminate species of eurypterids like Acutiramus .