Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 22w): GS9700, J38/f9681, Sutherlands, Tengawai River, South Canterbury, Altonian (GNS)
Beu & Maxwell (1990): Chapter 11; p. 215; pl. 22 w.
Synonymy: Kaitoa haroldi Marwick 1931, p. 155
Type species of Kaitoa Marwick, 1931
Description: Size moderate for family (height c. 15 mm), subcylindrical, involute. Apex with shallow depression largely filled by thin callus. Spiral sculpture of low, flat cords, some with median groove, interspaces mostly narrower than 1 cord and bearing thin axial costellae. Aperture very capacious anteriorly, narrower above; columella strongly concave, margined by a narrow, slightly raised callus. Outer lip thin, projecting slightly above apex, gently convex from posterior end to opposite columella, then swinging backwards sharply below.
Comparison: Kaitoa is apparently endemic to New Zealand, where it ranges from at least Otaian to Waipipian. It appears to be closely related to Scaphander Montfort, 1810, but differs in its more cylindrical shape and in lacking callus on the inner lip posterior to the columella.
Distribution: Altonian; Southburn Sand, White Rock River (type); Sutherlands, uncommon.
Cite this publication as: "A.G. Beu and J.I. Raine (2009). Revised
descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990). GNS
Science miscellaneous series no. 27."
© GNS Science, 2009
(Included with a PDF facsimile file copy of New Zealand Geological Survey Paleontological Bulletin 58 in CD version from: Publications Officer, GNS Science, P.O. Box 30368 Lower Hutt, New Zealand)