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Agilisaurus louderbacki
Taxonomy
Agilisaurus louderbacki was named by Peng (1990). Its type specimen is ZDM 6011, a skeleton, and it is a 3D body fossil. Its type locality is Dashanpu Dinosaur Quarry [lower], which is in a Bajocian/Oxfordian lacustrine sandstone/mudstone in the Shaximiao Formation of China.
Synonymy list
| Year | Name and author |
|---|---|
| 1990 | Agilisaurus louderbacki Peng figs. 1-6 |
| 1992 | Agilisaurus louderbacki Peng p. 39 figs. 1-6 |
| 1997 | Agilisaurus louderbacki Dong p. 121 |
| 1997 | Agilisaurus louderbacki Peng p. 238 |
| 1999 | Agilisaurus louderbacki Knoll p. 65 |
| 2002 | Agilisaurus louderbacki Buchholz p. 19 |
| 2004 | Agilisaurus louderbacki Norman et al. p. 394 |
| 2005 | Agilisaurus louderbacki Barrett et al. pp. 830-831 fig. 5 |
| 2005 | Agilisaurus louderbacki Peng et al. |
| 2008 | Agilisaurus louderbacki Butler et al. p. 8 |
| 2009 | Agilisaurus louderbacki Butler and Sullivan p. 26 |
| 2011 | Agilisaurus louderbacki Li et al. p. 23 |
| 2012 | Agilisaurus louderbacki Han et al. p. 1391 fig. 14 |
| 2012 | Agilisaurus louderbacki Zheng et al. p. 208 |
| 2016 | Agilisaurus louderbacki Becerra et al. p. 559–560 |
| 2018 | Agilisaurus louderbacki Alifanov p. 1636 |
| 2018 | Agilisaurus louderbacki Herne et al. p. 41 |
| 2019 | Agilisaurus louderbacki Andrzejewski et al. p. 12 |
| 2019 | Agilisaurus louderbacki Herne et al. p. 573 |
| 2020 | Agilisaurus louderbacki Dieudonné et al. |
| 2021 | Agilisaurus louderbacki Breeden et al. p. 9 |
| 2023 | Agilisaurus louderbacki Manitkoon et al. p. 1 |
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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.
†Agilisaurus louderbacki Peng 1990
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. M. Barrett et al. 2005 | (characters from the original diagnosis marked with ‘*’). A small ornithischian dinosaur that can be distinguished from other basal ornithischians by the presence of several cranial autapomorphies: presence of a palpebral/ supraorbital bar that traverses the width of the orbit* (acquired convergently in Dryosaurus); premaxillary teeth opposing three teeth in the rostral part of the dentary*; rostralmost dentary teeth conical, resembling premaxillary teeth; presence of a series of low, rostrolaterally directed ridges on the orbital portion of the frontal; and presence of an excavation or embayment on the ascending process of the maxilla, immediately rostral to the antorbital fossa. | |
| G. Peng et al. 2005 | Small cursorial primitive ornithopod recognized by short but deeper skull, strongly contracted interfenestral region of parietal; long nasal with a longitudinal median depression; posterior process of premaxilla no contact lachrymal; slightly dorsally positioned antorbital vacuity; orbit positioned laterally in posterior half of skull; quite well developed palpebral bridging over orbit; robust quadrate with transversely expanded mandibular condyle; higher coronoid eminence of mandible; lower positioned articular cavity; absence of external mandibular fenestra; dental formula Pm5 + M14 / D20; premaxillary teeth and first three dentary teeth recurved and canine-shaped while remaining dentary teeth and maxillary teeth diamond or leaf shaped with wear surface of varied degree; 9 cervicals, 15 dorsals, 5 sacrals, and at least 45 caudals; neck and trunk short while tail longer than half of its body length; ossified tendons confined to trunk and hip; scapula shorter than humerus; long ilium with a extraordinarily developed supra-acetabular flange; slender and rod-like postpubis; proximally placed obturator process of ischium; lesser trochanter of femur lower than greater trochanter, and presence of a deep cleft between them; pendent fourth trochanter of femur with a nutritive foramina at its base medially; tibia longer than femur; matatarsal III longer than 1/2 of femur length; pedal phalangeal formula 2-3-4-5-0; all pedal digits clawed. | |
| R. J. Butler et al. 2008 | Presence of a palpebral/supraorbital bar that traverses the width of the orbit; anteriormost dentary teeth conical, resembling premaxillary teeth; presence of a series of low, anterolaterally directed ridges on the orbital portion of the frontal; presence of an excavated area immediately anterior to the antorbital fossa. |