Hedleyoconcha addita, also known as the Lord Howe Island conical pinwheel snail, is a species of pinwheel snail that is endemic to Australia's Lord Howe Island in the Tasman Sea. MolluscaBase eds. (2021). MolluscaBase. Hedleyoconcha addita Iredale, 1944. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1149134 on 2021-07-12
