Kingdom: Animalia
Phylum: Annelida
Class: Clitellata
Subclass: Oligochaeta
Order: Haplotaxida
Family: Lumbricidae
 
The Lumbricidae are a family of earthworms which includes most of the earthworm species well-known to Europeans. About 33 lumbricid species have become naturalized around the world.
New Zealand has at least 171 species of native earthworms and 23 non-native species.

Photos below are of an 18 cm unnamed species found in New Plymouth.
Earthworm Family Lumbricidae-008.JPG

Earthworm Family Lumbricidae-001.JPG

Earthworm Family Lumbricidae-002.JPG

Earthworm Family Lumbricidae-003.JPG

Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0/