A Field Guide to the Snails of Lord Howe Island

90 Family Helicarionidae (Glass snails and semislugs) Key distinguishing features. Differs from G. sophiae sophiae by its larger, more flattened shell and darker body colouration. Habitat and occurrence. Summits and upper slopes of Mt Gower and Mt Lidgbird, and Little Slope. Listed as Critically Endangered. Very rare, possibly extinct. Found in litter, or in the crutch between palm stems and trunks. Remarks. Gudeoconcha sophiae magnifica is the largest helicarionid in Australia. Despite targeted collecting, this species has not been seen since 2002. If it is still extant, population size should be positively affected by the 2019 rodent eradication. Gudeoconcha sophiae sophiae Gudeoconcha sophiae magnifica 10 mm