Re: What is the genus and species for dingo, wolf and domestic dog.

According to Walker's Mammals of the World, the genus and species for wolves are Canis lupus, for domestic dogs Canis familiaris, and for dingoes Canis familiaris dingo. You can also find domestic dogs referenced in other sources as Canis lupus familiaris. Whether domestic dogs and wolves should be in the same species is a matter of how you want to apply the definition of a species; yes, they can breed with each other, but only in certain circumstances and almost never in nature. Lions and tigers can mate with each other, but they're still considered to be different species. Once you start with subspecies, it's much more contentious.

Rather than using the species designations, it may be better to answer your question by looking at the history of dogs. They definitely arose by domestication from gray wolves at least 12 000 years ago. Dingoes are most likely semi-domesticated dogs that wandered off and formed wild packs. If this is true, then domesticated dogs and dingoes are more closely related to each other than to wolves. Whether a species has become domesticated or not doesn't make a difference as to what it's related to. What matters is when that species and another species were last part of the same breeding population. In this case, domestic dogs and dingoes were part of the same population after that population separated from wolves, and so are more closely related to each other.

Nowak, RM. 1999. Walker's Mammals of the World, Volume 1. Johns Hopkins University Press, Baltimore. ISBN 0-8018-5789-9

Torsten Bernhardt Redpath Museum, McGill University