New Zealand and Australian species of the genus Leptochiton (Mollusca Polyplacophora) Author Sirenko, Boris text Zootaxa 2020 2020-09-11 4851 3 401 449 journal article 8566 10.11646/zootaxa.4851.3.1 1420a882-3007-4d6f-afbc-f486390b2215 1175-5326 4407805 D5837E58-53D6-4C51-A5C0-C96A31F26BC4 Leptochiton columnarius ( Hedley & May, 1908 ) ( Figure 46H ) The examination of photographs of the holotype of L. columnarius indicated that the antemucronal slope of the tail valve is one and a half times longer than the postmucronal slope. This is probably why this species was later placed in the genus Parachiton by Iredale & Hull (1925). L. columnarius is very similar to L. subantarcticus by its highly or very highly arched valves, but differs from the latter by having a posterior mucro.