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Diluvicursor pickeringi
Taxonomy
Diluvicursor pickeringi was named by Herne et al. (2018). Its type specimen is NMV P221080, a partial skeleton (partial postcranium, comprising an almost complete caudal vertebral series, the distal ends of the right tibia and fibula, complete right tarsus and partial rig), and it is a 3D body fossil. Its type locality is Eric the Red West, which is in an Aptian/Albian channel lag sandstone in the Eumeralla Formation of Australia.
Synonymy list
| Year | Name and author |
|---|---|
| 2018 | Diluvicursor pickeringi Bell et al. p. 1 |
| 2018 | Diluvicursor pickeringi Herne et al. |
| 2019 | Diluvicursor pickeringi Bell et al. p. 9 |
| 2019 | Diluvicursor pickeringi Herne et al. p. 543 |
| 2021 | Diluvicursor pickeringi Duncan et al. p. 2 |
| 2022 | Diluvicursor pickeringi Rotatori et al. p. 142 |
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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.
†Diluvicursor pickeringi Herne et al. 2018
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. C. Herne et al. 2018 | A turkey- to rhea-sized small-bodied ornithopod, differentiated from all other ornithopods by 10 potential autapomorphies: (1) dorsoventral height of the neural arch on the anterior-most caudal vertebrae (indicated at Ca 3), highly reduced and sub-equal to dorsoventral centrum height; (2) proximodistal length of the spinal process on the anterior caudal vertebrae (Ca 3–6), highly reduced and sub-equal to anteroposterior centrum length; (3) prezygapophysis on the anterior-most caudal vertebrae (up to Ca 5), horizontally oriented and located at the neural arch base, lateral to the neural canal; (4) tuberous process dorsally on the spinoprezygapophyseal lamina (sprl) of the anterior-most caudal vertebrae; (5) dorsoventrally narrowest part of the centrum on the posterior caudal vertebrae, distinctly offset posteriorly and embayed by a sulcus; (6) deep haemal groove present on all posterior caudal vertebrae; (7) triangular intervertebral process anteriorly on the centrum of the posterior-most caudal vertebrae incises a V-shaped notch at the posterior end of the adjoining centrum; (8) caudal ribs on the anterior-most caudal vertebrae (indicated at Ca 3) are transversely broad with the distance across the ribs ∼85% of total vertebral height (inclusive of haemal arch); (9) lateral distal tarsal embayed anteriorly by a sulcus for the calcaneum; and (10) pd IV-1 is strongly asymmetrical in dorsoplantar view (the proximal cotyle flares medially and the lateral edge is straight).
The taxon is further recognised by the combination of 12 shared features: (1) centrum on the middle caudal vertebrae deeply excavated by the haemal groove, as in Gasparinisaura cincosaltensis; (2) spinal process on the middle caudal vertebrae, steeply reclined to ∼30° from the dorsal plane, as in Valdosaurus canaliculatus; (3) distal end of the haemal process on the middle caudal vertebrae, anteroposteriorly expanded and distinct from the shaft, as in Gasparinisaura, Macrogryphosaurus gondwanicus, NMV P185992/P185993, NMV P186047, Parksosaurus warreni and Valdosaurus; (4) distal end of the haemal process on the middle caudal vertebrae, symmetrically expanded and disc-shaped, as in Parksosaurus; (5) distal end of haemal process on the posterior-most middle and posterior caudal vertebrae, asymmetrically expanded and boot-shaped, as in NMV P185992/P185993 and Camptosaurus dispar; (6) medial distal tarsal is thin, wavy and plate-like, quadrangular in shape and has a dorsoplantarly oriented groove on the proximal surface that extends between sulci on the dorsal and plantar margins, as in NMV P186047; (7) distal condyle on metatarsal (mt) I, plantomedially positioned relative to the diaphysis on mt II, as in Anabisetia saldiviai, NMV P185992/P185993 and NMV P1867047; (8) a hallux with relatively reduced dorsoplantar and transverse proportions (dorsoplantar heights of the distal condyle on mt I and pedal phalanx (pd) I-1 within 50% of the heights of the equivalent regions on pedal digit II), as in Anabisetia, Camptosaurus and NMV P186047; (9) pd I-1, asymmetric in dorsoplantar view, with the proximal cotyle flaring laterally while the medial edge is straight, as in NMV P185992/P185993; (10) plantar half of the diaphysis on mt II, transversely compressed to ≤50% of the equivalent region on mt III, as in Anabisetia, Dryosaurus altus, Dysalotosaurus lettowvorbecki, Gasparinisaura, Kangnasaurus coetzeei, NMV P186047, Morrosaurus antarcticus and Valdosaurus; (11) viewed proximally, mt II has a lunate profile (i.e. medially convex/laterally concave), as in Anabisetia, Gasparinisaura, Morrosaurus, NMV P186047 and the dryosaurids; and (12) viewed proximally, mt II has a keyhole-shaped profile as in Anabisetia, Eousdryosaurus nanohallucis and Gasparinisaura. |