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Polacanthidae (disused)
Taxonomy
Polacanthidae was named by Wieland (1911). Its type is Polacanthus.
It was corrected as Polacanthiidae by Naish and Martill (2001); it was synonymized subjectively with Nodosauridae by Coombs (1978), Tumanova (1987) and Galton (2019).
It was assigned to Ankylosauria by Ford (2000), Carpenter (2001), Kilbourne and Carpenter (2005) and Galton (2007); and to Ankylosauria by Naish and Martill (2001) and Kineer et al. (2016).
It was corrected as Polacanthiidae by Naish and Martill (2001); it was synonymized subjectively with Nodosauridae by Coombs (1978), Tumanova (1987) and Galton (2019).
It was assigned to Ankylosauria by Ford (2000), Carpenter (2001), Kilbourne and Carpenter (2005) and Galton (2007); and to Ankylosauria by Naish and Martill (2001) and Kineer et al. (2016).
Synonymy list
| Year | Name and author |
|---|---|
| 1911 | Polacanthidae Wieland p. 118 |
| 2000 | Polacanthidae Ford p. 174 |
| 2001 | Polacanthidae Carpenter p. 457 |
| 2001 | Polacanthiidae Naish and Martill p. 171 |
| 2005 | Polacanthidae Kilbourne and Carpenter p. 113 |
| 2007 | Polacanthidae Galton p. 19 |
| 2016 | Polacanthidae Kineer et al. p. 44 |
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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.
Fm. †Polacanthidae Wieland 1911
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. Kineer et al. 2016 | Inverted U-shaped premaxillary notch; short paroccipital process expanded distally, and rotated to face posteroventrally; suborbital horn a prominent, inverted, oblique tetrahedron; arcuate, flange-like acromion originating from dorsal margin and extending to mid-shaft of scapular blade posterior to glenoid; lateral cervical and shoulder osteoderms elongate, triangular, wedge shaped in cross-section and grooved along posterior margin; lateral body and caudal osteoderms of dorsoventrally compressed triangular plates, some with long distal spine (“splates”); coossified pelvic shield of rosettes formed by large, raised osteoderms surrounded by smaller raised osteoderms. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Marsh 1875 | |||||
Age range: base of the Late/Upper Berriasian to the top of the Aptian or 145.00000 to 113.00000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Berriasian - Valanginian | USA (Utah) | Polacanthidae indet. (50052) | |
| Late/Upper Berriasian - Valanginian | USA (Utah) | Ankylosauria indet. (97954) | |
| Early/Lower Barremian | Spain (Aragón) | Nodosauridae indet. (53921) | |
| Aptian | USA (Utah) | Hoplitosaurus sp. (49615) |