First records of the exotic garlic snail Oxychilus alliarius on Takapourewa and a reassessment of its distribution in New Zealand

Tuhinga 31: 120-128

ABSTRACT: We present the first report of an exotic snail from Takapourewa (also known as Stephens Island), New Zealand: Oxychilus alliarius (J.S. Miller, 1822), the garlic snail (Stylommatophora: Oxychilidae). This species has been introduced worldwide; it is widespread in New Zealand, where it is potentially problematic to the native fauna. We also revise the species’ distribution in New Zealand based on historical material deposited in the collection of the Museum of New Zealand Te Papa Tongarewa.

KEYWORDS: DNA barcode, introduced species, snails, Oxychilidae, Takapourewa, Stephens Island, Stylommatophora.