For various complicated (and so far, unexplained) reasons, Production IG was unable to use the Fuchikoma design in the 2002 Ghost in the Shell: Stand Alone Complex TV anime series.
However, Masamune Shirow was able to design a legally safe equivalent to the beloved spider-tanks for the new show, which he named the Tachikoma. There are distinct differences in the design, most significantly in the 'eyes' and the vertically-oriented abdomen. Still, the tanks are easily recognizable as descendants of the original Fuchikoma. Their AI 'personalities' and roles in the new series are indistinguishable from their predecessors in the manga.