Specimens of Alcithoe wilsonae and A. knoxi used to determine population variability in mitochondrial DNA (first 35), and shell morphometrics.

avoucher numbers with an M prefix denote specimens from the Museum of New Zealand Te Papa Tongarewa collection, voucher numbers with no letter prefix are from the collection of the National Institute of Water and Atmospheric Research (NIWA). Underlined voucher numbers indicate specimens that were not included in morphometric analyses.bcoordinates are given in decimal degrees, rounded to 3 decimal places.