The terrestrial invertebrate fauna of the LHIG is characterised by relatively high species richness and high endemism with up to 60% of some groups comprising endemic species. More than 1600 terrestrial invertebrate species have been recorded, including 157 land and freshwater snails, 464 beetles, 27 ants, 183 spiders, 21 earthworms, 137 butterflies and moths and 71 springtails. The rate of discovery of new species remains high, indicating that numerous endemic species are yet to be discovered.
The below list includes all listed threatened invertebrate species on Lord Howe Island currently impacted by rodents:
Whitelegge’s Land Snail
Has a loosely coiled shell of few whorls which is 13 to 16 mm in diameter and 6 mm in height. The shell is relatively flat with a depressed spire and a unicolour appearance of dark red-brown.
Masters’ Charopid Land Snail
Has a small shell (6.5 mm in diameter and 4.5 mm in height) of three whorls and a dull yellowish brown colouration, flamed with brown. It is the only member of a monotypic genus endemic to Lord Howe Island.
Mt Lidgbird Charopid Land Snail
Magnificent Helicarionid Land Snail
Gudeoconcha Sophiae Magnifica
Has a thin, bronze shell with a depressed spire, sculptured with fine ripple marks. Its dimensions are 35 mm in diameter and 20 mm high.