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Miragaia longicollum
Taxonomy
Miragaia longicollum was named by Mateus et al. (2009). Its type specimen is ML 433, a partial skeleton, and it is a 3D body fossil. Its type locality is Miragaia, which is in a Kimmeridgian terrestrial sandstone/sandstone in the Lourinhã Formation of Portugal.
It was synonymized subjectively with Dacentrurus armatus by Cobos and Gascó (2013); it was considered a nomen dubium by Maidment (2010).
It was synonymized subjectively with Dacentrurus armatus by Cobos and Gascó (2013); it was considered a nomen dubium by Maidment (2010).
Synonymy list
| Year | Name and author |
|---|---|
| 2009 | Miragaia longicollum Araújo et al. p. 3 fig. 2 |
| 2009 | Miragaia longicollum Mateus p. 144A |
| 2009 | Miragaia longicollum Mateus et al. |
| 2009 | Miragaia longicollum Ortega et al. p. 49 |
| 2010 | Miragaia longicollum Galton p. 190 |
| 2013 | Miragaia longicollum Ruiz-Omeñaca et al. p. 37 |
| 2014 | Miragaia longicollum Ulansky p. 7 |
| 2019 | Miragaia longicollum Costa and Mateus p. 20 |
| 2020 | Miragaia longicollum Maidment et al. p. 92 |
| 2023 | Miragaia longicollum Manitkoon et al. p. 3 |
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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.
†Miragaia longicollum Mateus et al. 2009
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| O. Mateus et al. 2009 | Differs from other stegosaurs in the presence of the following autapomorphies: (i) anterior tip of the premaxilla is drawn into a point, (ii) anterolateral rim of the premaxilla projects ventrally, (iii) at least 17 cervical vertebrae, (iv) mid-cervical neural spines possess a notch at their base with an anterior projection dorsal to it, (v) mid and posterior cervical and anterior dorsal neural spines with transversely expanded apices, and (vi) paired, slightly outwardly convex, triangular cervical dermal plates with a notch and projection on the anterodorsal margin.
| |
| F. Costa and O. Mateus 2019 | Modified from [22]: Differs from other stegosaurs in the presence of the following autapomorphies: (i) anterior tip of the premaxilla is drawn into a point; (ii) anterolateral rim of the premaxilla projects ventrally; (iii) at least 17 cervical vertebrae; (iv) spinopostzygapophyseal lamina extending anteriorly from the epipophyses, accompanied medially by a pair of lower parallel ridges, passing laterally on the neural spine and culminating on an anterior projection on the base of the neural spine with a notch ventral to it (revised autapomorphy from [22]); (v) mid and posterior cervical and anterior dorsal neural spines with trans- versely expanded apices; (vi) paired, slightly inwardly convex, triangular cervical dermal plates with a notch and projection on the posterodorsal margin (revised autapomorphy from [22]); (vii) cervical neural spines are positioned over the anterior half of the centrum and become progressively more anteriorly positioned passing posteriorly on the cervical series; (viii) cervical transverse processes more than half the axial length of the centrum in all but the anteriormost cervical vertebrae; (ix) outline in lateral view of cervical prezygapophyses round posteriorly and straight anteriorly with an anterodorsal notch; (x) closed proximodorsal canal on the ribs of the first caudal vertebra; (xi) progressively more posteriorly inclined neural spines of anterior caudal vertebrae, inclined at less than 45° to the horizontal between Cd8 and Cd11; (xii) neural spine reduced to one fifth the height and width from the 10th to the 12th caudal vertebra, vestigial further posteriorly in the vertebral series; (xiii) presence of longitudinal cord-like ridges in the femur shaft, two posteriorly and one anterolaterally positioned, with distal bifurcation. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Marsh 1875 | |||||
Age range: base of the Late/Upper Kimmeridgian to the top of the Tithonian or 152.21000 to 143.10000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Kimmeridgian | Portugal (Centro) | Miragaia longicollum (type locality: 87089) | |
| Tithonian | Portugal (Centro) | Miragaia longicollum (221549) |