Unaysauridae
| Unaysaurids Temporal range: Late Triassic,
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|---|---|
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| Restoration of Unaysaurus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha |
| Clade: | †Bagualosauria |
| Clade: | †Unaysauridae Müller et al., 2018 |
| Genera | |
Unaysauridae is a clade of basal sauropodomorphs from the Late Triassic of India and Brazil.
Diagnosis and systematics
[edit]Unaysauridae was defined by Müller et al. (2018) as the most inclusive clade including Unaysaurus tolentinoi, but not Plateosaurus engelhardti nor Saltasaurus loricatus.[1]
Members of Unaysauridae are diagnosed by a substantially expanded cranial part of the medial condyle of the astragalus, as well as a promaxillary fenestra. Unaysauridae is sister to Plateosauria, more derived than Nambalia, Thecodontosaurus ISI R277, Pantydraco, and Efraasia.[1] Unaysaurus and Jaklapallisaurus had previously been assigned to Plateosauridae by prior authors.[2][3] However, Beccari et al. (2021) questioned the validity of Unaysauridae in their description of Issi saaneq because it "suffers from the missing data and fragmentary nature of specimens. For example, one synapomorphy of unaysaurids is related to the astragalus medial end length ratio to the anteroposterior length of the lateral end, a which has not been confirmed in U. tolentinoi, whereas a second synapomorphy, the presence of a promaxillary fenestra, cannot be observed in J. asymmetrica which lacks the required cranial remains."[4] Subsequently, their phylogenetic analysis recovered Unaysaurus and Macrocollum within Plateosauridae.[4]
References
[edit]- ^ a b Rodrigo Temp Müller; Max Cardoso Langer; Sérgio Dias-da-Silva (2018). "An exceptionally preserved association of complete dinosaur skeletons reveals the oldest long-necked sauropodomorphs". Biology Letters. 14 (11): 20180633. doi:10.1098/rsbl.2018.0633. PMC 6283919. PMID 30463923.
- ^ Leal, L.A.; Azevodo, S.A.K.; Kellner, A.A.W.; da Rosa, A.A.S. (2004). "A new early dinosaur (Sauropodomorpha) from the Caturrita Formation (Late Triassic), Paraná Basin, Brazil" (PDF). Zootaxa. 690: 1–24. doi:10.11646/zootaxa.690.1.1. Archived (PDF) from the original on November 19, 2023.
- ^ Novas, Fernando E.; Ezcurra, Martín D.; Chatterjee, Sankar; Kutty, T.S. (2011). "New dinosaur species from the Upper Triassic Upper Maleri and Lower Dharmaram formations of central India". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 101 (3–4): 333–349. doi:10.1017/S1755691011020093.
- ^ a b Beccari, Victor; Mateus, Octávio; Wings, Oliver; Milàn, Jesper; Clemmensen, Lars B. (2021-11-03). "Issi saaneq gen. et sp. nov.—A New Sauropodomorph Dinosaur from the Late Triassic (Norian) of Jameson Land, Central East Greenland". Diversity. 13 (11): 561. doi:10.3390/d13110561. hdl:10362/128951. ISSN 1424-2818.
