Acostasaurus enters the LRT

Pérez and Noé 2017 described
a near complete 3D skull, a complete hindlimb and several vertebrae of a eusauropterygian, Acostasaurus (Fig. 1), they considered it a 4-5m long, snort-snouted pliosaur, one of many ‘pliosaurs’ found in Barremian (Early Cretaceous) Columbia. 

Figure 1. Acostasaurus skull from Pérez and Noé 2017, colors added.

Figure 1. Acostasaurus skull from Pérez and Noé 2017, colors added.

Some of those purported Columbian ‘pliosaurs’
turned out to be giant sisters to more basal eusauropterygians in the large reptile tree (LRT, 1430 taxa). You might remember (here) the giant Sachicasaurus nested with Nothosaurus and (here) the very large Bobosaurus nested with the smaller Corosaurus.

In the LRT
Acostasaurus nests with Anningsaura (Fig. 2) apart from the pliosaurs in the LRT.

Figure 6. Anningasaura colorized from an old engraving. No other aquatic taxon has such bizarrely curved teeth. This taxon is closely related to Hauffiosaurus.

Figure 6. Anningasaura colorized from an old engraving. No other aquatic taxon has such bizarrely curved teeth. This taxon is closely related to Hauffiosaurus.

The authors compared Acostasaurus
with Simolestes a taxon not yet added to the LRT. Look for it soon.

Figure 4. Subset of the LRT focusing on Eusauropterygians (pachypleurosaurs, nothosaurs, plesiosaurs and kin).

Figure 4. Subset of the LRT focusing on Eusauropterygians (pachypleurosaurs, nothosaurs, plesiosaurs and kin).


References
Gómez Pérez M and Noè LF 2017. Cranial anatomy of a new pliosaurid Acostasaurus pavachoquensis from the Lower Cretaceous of Colombia, South America. Palaeontographica Abteilung A. 310 (1–2): 5–42. doi:10.1127/pala/2017/0068.

wiki/Acostasaurus

3 thoughts on “Acostasaurus enters the LRT

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