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The body of Acutiramus was very slender, with members of the genus being almost five times as long as they were wide. [3] Acutiramus can be distinguished from other pterygotids by the distal margin of the chelae (pincers), where the final tooth is at an acute angle relative to the rest of the claw. The large tooth in the center of the claw is ...
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 ...
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 .
The fragmentary fossils closely resemble fossils of Erettopterus bilobus (classified as a species of Pterygotus at the time), which might make their assignment to Pterygotus questionable. [19] In 2020, the species was marked as a nomen dubium (a dubious species) due to the lack of sufficient diagnostic material to separate P. australis from the ...
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 ...
Fossils of microbes, sea sponges, insects, sharks, early amphibians and mammals have been discovered in the rocks around the state, representing over 1 billion years of life on Earth.
Fossil of the Silurian-Early Devonian eurypterid ("sea scorpion") Acutiramus †Acutiramus †Acutiramus floweri – type locality for species †Acutiramus macrophthalmus †Adelphobolbina †Adelphobolbina medialis – type locality for species †Aechmina †Aechminaria – tentative report †Aesopomum †Aglaeoglypta †Aglaeoglypta koeneni
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 ...