A Tachikoma (タチコマ) is a fictional AI walker/roller tankette in the Ghost in the Shell universe, appearing in the manga created by Masamune Shirow and the Ghost in the Shell: Stand Alone Complex sub-universe. Nine of them are assigned to Section 9's use originally. They are best described as a "spider type multi leg combat vehicle equipped with artificial intelligence". The spider design appears in other places in Shirow's other work, like the Appleseed manga. Shirow is noted to keep numerous spiders as pets.

Fuchikomas were suppose to be used in the SAC series, but were never seen due to copyright issues.

Source: Wikipedia