Macrourus

Mcmillan, Peter, Iwamoto, Tomio, Stewart, Andrew & Smith, Peter J, 2012, A new species of grenadier, genus Macrourus (Teleostei, Gadiformes, Macrouridae) from the southern hemisphere and a revision of the genus, Zootaxa 3165, pp. 1-24 : 22

Key to species of Macrourus

1. Underside of head without scales or with up to 8 small patches of scales (usually less than 10 small scales per patch) adjacent to angles of the mouth and at posterior of head, rarely any scales on lower jaw (Fig. 12).............................. 2

- Underside of head with scales present in rows (not just small patches) extending forward from posterior part of head to below anterior margin of orbit or nostrils between suborbital ridge and mouth, and scales on base of lower jaw (Fig. 13)......... 3