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With an estimated length of 33.9 cm (13.3 in) based on the assumption that the fossil was that of a spider, and with a leg-span estimated to be 50 centimetres (20 in), Megarachne servinei would have been the largest spider to have ever existed; exceeding the goliath birdeater (Theraphosa blondi), which has a maximum leg-span of around 30 cm (12 ...
History and classification [ edit ] Mongolarachne jurassica is known only from two fossils, the holotype , specimen number "CNU-ARA-NN2010008" which is a mostly complete adult female and the later described allotopotype male, number CNU-ARA-NN2011001-1 (part) and CNU-ARA-NN20110001-2 (counterpart).
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 ...
The group's origins lie within an arachnid sub-group defined by the presence of book lungs (the tetrapulmonates); [1] [2] the arachnids as a whole evolved from aquatic chelicerate ancestors. More than 45,000 extant species have been described, organised taxonomically in 3,958 genera and 114 families. [3] There may be more than 120,000 species. [3]
The largest thalattosuchian as well as the largest teleosauroid was unnamed fossil remain from Paja Formation, which may belongs to animal with length of 9.6 m (31 ft), [368] which is as large as outdated length estimate of the Early Cretaceous Machimosaurus rex, more recently estimated at 7.15 m (23.5 ft) in length. [369]
Jaekelopterus is the largest known eurypterid and the largest known arthropod to have ever existed. This was determined based on a chelicera (claw) from the Emsian Klerf Formation of Willwerath, Germany , that measures 36.4 centimetres (14.3 in) long, but is missing a quarter of its length, suggesting that the full chelicera would have been 45. ...
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The walking legs again follow the typical arachnid plan with a coxa, trochanter, femur, patella, tibia, metatarsus and tarsus. [1] The coxae surround a single sternum. In well preserved palaeocharinids there is a ring, or annulus, around the trochanter–femur joint which may be the remains of an earlier leg segment. [35]