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The camel spider is larger than all those. It is not really a spider but is still considered an arachnid.
The largest species of arachnid is probably the Goliath birdeater However, of very comparable dimensions and possibly even greater mass, are the Chaco golden knee and the Brazilian salmon pink. Tarantulas have been recorded as reaching a leg width of 28 cm (11 in), a body length over 9 cm (3.5 in) and a body weight exceeding 85 g (3 oz), making them dinner plate-sized spiders.
The largest species of arachnid by length is probably the Giant Huntsman spider (Heteropoda maxima) of Laos, which in 2008 replaced the Goliath birdeater (Theraphosa blondi) of Northern South America as the longest-known spider. However the most massive arachnids, of comparable dimensions and possibly even greater mass, are the Chaco golden knee, Grammostola pulchripes, and the Brazilian salmon pink, Lasiodora parahybana.