the Biological Species Concept because the dog can interbreed with the grey wolf Canis lupus, and classified as Canis familiaris under the Evolutionary Species Concept because the dog has commenced down a separate evolutionary pathway to the grey wolf. In 2015, the Taxonomy of Australian Mammals classed the dingo as Canis familiaris. In 2017, a review of the latest scientific information proposes that the dingo and New Guinea singing dog are both types of the domestic dog Canis familiaris. The Australian Government's Australian Faunal Directory lists the dingo under Canis familiaris. In 2018, the taxonomic reference Walker's Mammals of the World recognised the dingo as Canis familiaris dingo. The Australian National Kennel Council recognises a dingo breed standard within its Hounds group. In 2019, a workshop hosted by the IUCN/SSC Canid Specialist Group considered the New Guinea singing dog and the dingo to be feral dogs Canis familiaris, and therefore should not be assessed for the IUCN Red List. In 2020, the American Society of Mammalogists considered the dingo a synonym of the domestic dog. Genomic evidence The sequencing of ancient dog genomes indicates that dogs share a common ancestry and descended from an ancient, now-extinct wolf population – or closely related wolf populations – which was distinct from the modern wolf lineage. By the close of the last ice age 11,700 years ago, five ancestral lineages had diversified from each other and were expressed in ancient dog samples found in Karelia (10,900 ), Lake Baikal (7,000 ), the Levant (7,000 ), ancient America (4,000 YBP), and in the New Guinea singing dog (present day). The dingo is a basal member of the domestic dog clade. "The term basal taxon refers to a lineage that diverges early in the history of the group and lies on a branch that originates near the common ancestor of the group." Mitochondrial genome sequences indicates that the dingo falls within the domestic dog clade, and that the New Guinea singing dog is genetically closer to those dingoes that live in southeastern Australia than to those that live in the northwest. Taxonomic synonyms A taxonomic synonym is a name that applies to a taxon that now goes by a different name. In 2005, W. Christopher Wozencraft in the third edition of Mammal Species of the World listed under the wolf Canis lupus the subspecies dingo along with its proposed taxonomic synonyms: dingo Meyer, 1793 [domestic