Liphistius sp. 'Khao Luang Big Black' SpiderLiphistius sp. "Khao Luang Big Black" Spider for sale This species of armored trap door reaches around 3. 5" legspan and has a jet black coloration! These hatch very small at about 1 8". The armored trapdoor spiders (Liphistius genus) are one of the most unique and interesting groups of arachnids in the world! Liphistius renouned for looking like walking fossils literally. These look like minature versions of the first spider like fossils we see in