Powelliphanta spedeni, known as one of the amber snails, is a species of large, carnivorous land snail, a terrestrial pulmonate gastropod mollusc in the family Rhytididae.
This species is endemic to the South Island of New Zealand. There are two subspecies:
The shell of Powelliphanta spedeni reaches a maximum size of 40 mm.
Powelliphanta spedeni produces an egg up to the size of 11.5 mm. Shape of the eggs is oval and seldom constant in dimensions 11.5 ÃÂ 9 mm, 11 ÃÂ 9 mm, 9 ÃÂ 7.75 mm. Its eggs are laid in March.