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:[1]
The shell of Powelliphanta spedeni reaches a maximum size of 40 mm.[2]
Powelliphanta spedeni produces an egg up to the size of 11.5 mm.[2] Shape of the eggs is oval and seldom constant in dimensions 11.5 × 9 mm, 11 × 9 mm, 9 × 7.75 mm.[2] Its eggs are laid in March.[2]