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Enigmacursor mollyborthwickae

Osteichthyes

Taxonomy
Enigmacursor mollyborthwickae was named by Maidment and Barrett (2025). Its type specimen is NHMUK PV R 3900, a partial skeleton (Partial skeleton that includes three teeth, three cervical, 11dorsal, two dorsosacral and five caudal vertebrae, 10 dorsal ribs, five chevrons, right sternum, b), and it is a 3D body fossil. Its type locality is Skull Creek Estate, which is in a Kimmeridgian/Tithonian wet floodplain mudstone in the Morrison Formation of Colorado. It is the type species of Enigmacursor.

Synonymy list
YearName and author
2025Enigmacursor mollyborthwickae Maidment and Barrett p. 3 figs. 1-13

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

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.

†Enigmacursor mollyborthwickae Maidment and Barrett 2025
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Diagnosis
ReferenceDiagnosis
S. C. R. Maidment and P. M. Barrett 2025Enigmacursor mollyborthwickae differs from all other ornithischian dinosaurs inpossessing the following unique combination of features and one potential autapomorphy (the lattermarked with an asterisk): (1) posterior articular facets offset ventrally relative to anterior articularfacets on proximal dorsal vertebrae*; (2) absence of a supracetabular crest on the ilium; (3) femoralhead separated from the greater trochanter by a trochanteric fossa; (4) apex of anterior trochantersituated level with the ventral margin of the femoral head; (5) absence of a ligament sulcus on theposterior surface of the femoral head; (6) ventral surface of fourth trochanter straight or slightly convexin medial or posterior view; (7) medially directed, hook-like posterior condyle of the proximal end ofthe tibia.
Measurements
No measurements are available
Composition: hydroxyapatiteo
Entire body: yeso
Adult length: 10 to < 100o
Adult width: 1.0 to < 10o
Adult height: 1.0 to < 10o
Architecture: compact or denseo
Ontogeny: accretion, modification of partso
Grouping: gregariouso
Environment: terrestrialo
Locomotion: actively mobileo
Life habit: ground dwellingo
Diet: herbivoreo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2004-12-14 12:50:52
Modified: 2004-12-14 14:50:52
Source: o = order
References: Marsh 1875, Kiessling 2004

Age range: base of the Kimmeridgian to the top of the Tithonian or 154.80000 to 143.10000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Kimmeridgian - Tithonian154.8 - 143.1USA (Colorado) Enigmacursor mollyborthwickae (type locality: 241291)