Order Opiliones, commonly referred to as harvestmen or daddy longlegs, is a group of arachnids characterized by their long, thin legs and compact, oval-shaped bodies. While the term "Opiliones" is commonly used to refer to this order, there are several other synonyms that have been used throughout history. Some of these include "Phalangida," "harvest spiders," "shepherd spiders," and "granddaddy longlegs." Each of these terms has been used to distinguish harvestmen from other arachnids and highlight their unique characteristics. Despite the different names, all of these terms refer to the same order of arachnids that can be found in a wide range of habitats across the world.