There has been much debate about the monophyly of Sphenosuchia in the last 15 years, some arguing for its existence (e.g. Sereno and Wild 1992, Wu and Chatterjee 1993) and others against (e.g. Clark et al. 2001, Clark and Sues 2002). Recently Sues et al. (2003) again yielded a tree with weak support for sphenosuchian monophyly.
Here the taxon is anchored by one of its most derived members, Terrestrisuchus gracilis, and includes the eponymous, albeit more basal, Sphenosuchus acutus. In this way, use of the taxon Sphenosuchia, defined here for the first time, wwill be limited to clades that capture the historical essence of the name.