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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 ...
Mongolarachne is an extinct genus of spiders placed in the monogeneric family Mongolarachnidae.The genus contains only one species, Mongolarachne jurassica, described in 2013, which is presently the largest fossilized spider on record. [1]
A mega-sauropod, Maraapunisaurus fragillimus (previously known as Amphicoelias fragillimus), is a contender for the largest-known dinosaur in history. It has been estimated at 58–60 m (190–197 ft) in maximum length and 122,400 kg (269,800 lb) in weight. [408]
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The genus name honors the Douglass family, who donated the specimen to Chicago’s Field Museum of Natural History, and the species name references the spines that make this arachnid so distinctive.
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. ...
A new tarantula species, Aphonopelma jacobii, was recently discovered in Arizona. Researchers say they are docile and have striking colors.
The Goliath birdeater (Theraphosa blondi) belongs to the tarantula family Theraphosidae.Found in northern South America, it is the largest spider in the world by mass (175 g (6.2 oz)) and body length (up to 13 cm (5.1 in)), and second to the giant huntsman spider by leg span. [1]