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Fruitadens haagarorum

Reptilia - Heterodontosauridae

Taxonomy
Fruitadens haagarorum was named by Butler et al. (2010). Its type specimen is LACM 115747, a partial skeleton, and it is a 3D body fossil. Its type locality is FPA General Site (LACM), which is in a Tithonian floodplain sandstone/siltstone in the Morrison Formation of Colorado.

Synonymy list
YearName and author
2010Fruitadens haagarorum Butler et al. p. 376 figs. 2, 3
2011Fruitadens haagarorum Nesbitt et al. p. 149
2012Fruitadens haagarorum Han et al. p. 1391 fig. 14
2012Fruitadens haagarorum Sereno p. 48
2016Fruitadens haagarorum Becerra et al. p. 557
2016Fruitadens haagarorum Foster et al. p. 45
2018Fruitadens haagarorum Carpenter and Galton p. 169–170
2019Fruitadens haagarorum Veiga et al. p. 13
2020Fruitadens haagarorum Dieudonné et al.

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
RankNameAuthor
subclassEureptilia()
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
familyHeterodontosauridae
subfamilyHeterodontosaurinae
genusFruitadens
specieshaagarorum

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Fruitadens haagarorum Butler et al. 2010
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Diagnosis
ReferenceDiagnosis
R. J. Butler et al. 2010Small heterodontosaurid ornithischian characterized by the following unique combination of characters, including autapomorphies (*indicates character that is autapomorphic within Heterodontosauridae; **indicates character that is autapomorphic within Ornithischia): (1*) premaxillary crowns small and subequal in size, expanded labiolingually and mesiodistally above the root; (2) maxillary caniniform absent; (3) maxillary/dentary crowns low and triangular, with symmetrically distributed enamel; (4*) denticles extend over half of the maxillary/dentary crowns, not restricted to apical third; (5**) dentary caniniform present but apicobasal height does not exceed that of the largest dentary cheek tooth crown; (6**) small, unserrated, peg-like and procumbent tooth present anterior to the dentary caniniform; (7**) distal end of the tibia with anteromedial flange; (8**) apex of the ascending process of astragalus is formed by a separate ossification; (9**) two large foramina pierce anterior surface of the ascending process of astragalus.
P. C. Sereno 2012Heterodontosaurid with (1) a discordantly small dentary tooth
immediately distal to the caniniform dentary tooth and (2) a prominent anteromedial flange on the distal end of the tibia.
K. Carpenter and P. M. Galton 2018They differ from the other Morrison neornithischians in (1) the presence of three premaxillary teeth and a caniform dentary tooth preceded by a small peg-like tooth, (2) a ventrally projecting midline para-hypophysis on the posterior cervical centrum, (3) the high position of the deltopectoral crest on the humerus, (4) the slenderness of the hind limb and an elongate tibia with an anteromedial flange distally, (5) an astragalus with ascending process as a separate ossification and with two foramina anteriorly, and (6) fusion of the distal tibia, fibula, astragalus and calcaneum with a pulley-like transversely narrow distal articular surface.