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Jaekelopterus is a genus of predatory eurypterid, a group of extinct aquatic arthropods. Fossils of Jaekelopterus have been discovered in deposits of Early Devonian ...
Jaekelopterus, previously designated as a species of Pterygotus, was separated into a distinct genus in 1964 based on the supposed different segmentation of the genital appendage. These supposed differences would later turn out to be false, but briefly prompted Jaekelopterus to be classified within a family of its own, the "Jaekelopteridae".
Studies on a well-preserved fossil assemblage of eurypterids from the Pragian-aged Beartooth Butte Formation in Cottonwood Canyon, Wyoming, composed of multiple specimens of various developmental stages of eurypterids Jaekelopterus and Strobilopterus, revealed that eurypterid ontogeny was more or less parallel and similar to that of extinct and ...
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 ...
Like its close relative Jaekelopterus, Pterygotus was a large and active predator noted for its robust and enlarged cheliceral claws that would have allowed it to puncture and grasp prey and a visual acuity (clarity of vision) comparable to that of modern predatory arthropods.
However, Pentecopterus was overtaken by other eurypterids such as Jaekelopterus rhenaniae, the largest known arthropod with 2.5 metres (8 ft 2 in). A replica of the eurypterid was created for the National Geographic's "The Strange Truth" program.
This massive size makes C. punctatum the largest of all known carcinosomatoid eurypterids and it rivals the largest pterygotid eurypterids, such as the 2.5-meter (8.2 ft) long Jaekelopterus, in size. [1] [2] Other species of Carcinosoma were smaller, most being in the range of 70 centimeters (2.3 ft) to 100 centimeters (3.3 ft) in length. [2]
In it Jaekelopterus rhenaniae, a giant eurypterid was discovered. The Klerf Formation, comprising greenish and reddish shales, siltstones and sandstones, was first described in 1919 by Rudolf Richter (1881-1957) and reaches a maximum thickness of about 1,300 metres (4,300 ft). [1]