Early – showing its body structure and long legs: one pair of eyes and broadly joined body tagma differentiate it from similar-looking arachnids Kingdom: Phylum: Subphylum: Class: Order: Opiliones, 1833 Suborders • • • • • 5 suborders, >Minecraft Military Base Attack. 6,650 species The Opiliones or (formerly Phalangida) are an of known as harvestmen, harvesters or daddy longlegs. As of April 2017, over 6,650 species of harvestmen have been discovered worldwide, although the total number of species may exceed 10,000. The order Opiliones includes five suborders:,,,, and the recently named. Representatives of each extant suborder can be found on all continents except. Well-preserved fossils have been found in the 400-million-year-old of Scotland, and 305-million-year-old rocks in France, which look surprisingly modern, indicating that their basic body plan appeared very early on, and, at least in some taxa, has changed little since that time. Their position within the Arachnida is disputed: their closest relatives may be the mites () or the (the,, and ). Cultural Anthropology The Human Challenge 13th Edition Test Bank there.

Although superficially similar to and often misidentified as (order ), the Opiliones are a distinct order that is not closely related to spiders. They can be easily distinguished from long-legged spiders by their fused body regions and single pair of eyes in the middle of the. Spiders have a distinct abdomen that is separated from the cephalothorax by a constriction, and they have three to four pairs of eyes, usually around the margins of the cephalothorax. English speakers may colloquially refer to species of Opiliones as 'daddy longlegs' or 'granddaddy longlegs', but this name is also used for two other unrelated groups of: the of the family Tipulidae, and the of the family Pholcidae, most likely because of their similar appearance.