Heterodontosaurinae Kuhn, 1966

Sereno, Paul C., 2012, Taxonomy, morphology, masticatory function and phylogeny of heterodontosaurid dinosaurs, ZooKeys 226, pp. 1-225 : 41-42

Heterodontosaurinae Kuhn, 1966

Diagnosis.

Small-bodied ornithischians with the following features that likely would constitute synapomorphies in phylogenetic context: (1) cheek tooth crowns that are taller than wide, (2) jaw joint set below the axis of occlusion between maxillary and dentary teeth.

Phylogenetic definition.

The most inclusive clade containing Heterodontosaurus tucki Crompton and Charig 1962 but not Tianyulong confuciusi Zheng et al. 2009, Fruitadens haagarorum Butler et al. 2010, Echinodon becklesii Owen 1861. This stem-based phylogenetic definition for this new heterodontosaurid subgroup includes Heterodontosaurus tucki and other derived heterodontosaurid species but specifically excludes basal species with less modified teeth that retain subtriangular crowns enveloped in symmetrical enamel.

Temporal and geographic range.

Earliest Jurassic (Hettangian-Sinemurian) to Middle Jurassic or earliest Late Jurassic (Aalenian-Callovian), ca. 197-165 Ma ( Gradstein and Ogg 2009; Pol et al. 2011); distribution limited to southern localities including Argentina and southern Africa (Fig. 1B).

Comments.

Authorship of family group names is given to the author of the first name coined within the family group ( ICZN 1999), which in this case is Heterodontosauridae Kuhn 1966.