Spiders of the family Archaeidae are unusual in that they have "necks", which can be very long and slender, or short and fat. Archaeids prey only upon other spiders. Assassin spiders were first known from 40 million year old amber fossils which were found in Europe in the 1840s, and were not known to have living varieties until 1881, when the first living assassin spider was found in Madagascar. They are native to Australia, South Africa, and Madagascar, with the sister family Mecysmaucheniidae occurring in southern South America and New Zealand. They range in size from 2–8 mm.
This site contains all about Assassin Spider Archaeidae.