Its feet are tipped with tiny hooked claws that enable it to scuttle on ceilings and vertical walls. It constricts its foe with thin and strong silk webbing.
(From Bulbapedia)Ariados is a Pokémon that resembles a spider. It has a red body with black stripes and markings on its rear that form a face. In the center of its head is a small, white horn. Additionally, it also has small purple eyes and a pair of white mandibles. Ariados has four yellow legs with purple stripes; long, pointed growths on its back appear to be remnants of its fifth and sixth legs. Ariados's feet are tipped with tiny hooked claws that enable it to scuttle on ceilings and vertical walls. It spins a single strand of a special string endlessly out of its rear. The string can also be spun from its mouth; however, it is hard to tell which end is which.
Rather than making a nest in one specific spot, it wanders to hunt aggressively after darkness falls. It will attach silk to its prey and set it free. Later, it tracks the silk to the prey and its friends. It spews thread on prey before biting into them with its fangs. Ariados makes its nest in the depths of the forest. Ariados and its pre-evolution Spinarak are the only known Pokémon that can learn Toxic Thread.
(From Bulbapedia) Ariados's appearance is based on the Myrmarachne formicaria spider, but with the prosoma (thorax and head area) and opisthosoma (abdominal area) reversed, fitting with its Pokédex entry. Its ability to spin string from its mouth and its signature move likely refer to spitting spiders, which spit venomous silk from their chelicerae to capture prey.
(From Bulbapedia) Ariados may be named after the Greek myth of Theseus and Ariadne, wherein Ariadne gave Theseus a ball of twine before he entered the Labyrinth to slay the Minotaur, so that he may trail the strand behind him and find his route back to her. Ariados may also be a combination of arachnid (Latin for spider) and 脅す odosu (to threaten) or dos (Spanish for two, used possibly because it has two stingers, or because it is the second form in its evolutionary line).