Anisochaeta gigantea (formerly Spenceriella gigantea or Celeriella gigantea),[1][2][3] commonly called the North Auckland worm, is a rare giant annelid of the family Megascolecidae, endemic to New Zealand.

The North Auckland worm is New Zealand's largest, reaching 1.4 m (4 ft 7 in) long, and 11 mm (0.43 in) in diameter.

Its burrows are up to 20 mm (0.79 in) in diameter, and reach a depth of 3.5 m (11 ft).

[4] The type locality is on Little Barrier Island on a plateau 200 metres (660 ft) above sea level in forest subsoil.

[4] Under both the New Zealand Threat Classification System and IUCN Redlist it is classed a "Data Deficient".