Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 56f): Acteon chattonensis Marwick, 1929; topotype, GS9806, F45/f7668, Shell Gully, Chatton, Southland (Duntroonian)
Beu & Maxwell (1990): Chapter 17; p. 390; pl. 56 f.
Description: Height typically 3-10 mm for New Zealand fossil species but some up to 15 mm, ovate, spire low to moderately elevated. Protoconch heterostrophic, tilted. Teleoconch whorls lightly to moderately convex, last whorl very capacious; sculpture of narrow spiral grooves, typically with fine axial costellae within. Aperture large, anterior end rounded, posterior end constricted; columella subvertical, with a single plait at posterior end.
Comparison: Pupa Röding, 1798 has a bifid plait; Ongleya Finlay & Marwick, 1937 and Tornatellaea Conrad, 1860 have two columellar plaits; Triploca Tate, 1893 has three. Species referred to Leucotina A. Adams, 1860 (see Pl. 49o) formerly were placed in Acteonidae but differ from Acteon in being higher-spired and in typically having more prominent sculpture, and were referred to Amathinidae by Ponder (1987). Crenilabium Cossmann, 1889 is taller and narrower than Acteon, and has a concave columella lacking plaits but bearing numerous fine transverse ridges (Pl. 26r).
Distribution: Wangaloan-Recent, New Zealand; cosmopolitan, Late Cretaceous-Recent. Most records of modern New Zealand species of Acteon are from mid to outer shelf or upper bathyal depths, but at least some of the fossil species lived in shallower waters.
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)