Tachiraptor admirabilis is a basal near-averostran sauropod from the La Quinta formation of Venezuela. La Quinta, sounds familiar, right? Yep, Laquintasaura is not safe. You can also see the poor little ornithopods in the image above.
The remains, which consist of a tibia and partial pelvis, were briefly described in the Laquintasaura paper. This is the full description.
Tachiraptor has a number of interesting implications for the evolution of theropods. Averostra - consisting of the majority of post-Triassic theropods - have very obscure origins, with very few definite specimens from the Upper Jurassic.Tachiraptor is a major factor in clearing up the course of the evolution of theropods - the existence of Tachiraptor within the dilophosaurid-like group of theropods implies that averostrans did indeed have its origins during this time and at this place. It also provides some insight into how a ‘ghost lineage’, or implied evolutionary path, of averostran theropods, might have survived over the course of the Jurassic to develop into the famous allosaurs, tyrannosaurs, and maniraptorans that we all love.
The PalaeoFellows, as usual, have come up with a design, albeit slightly late. Since not much of Tachiraptor is known, here it’s a hybrid of Cryolophosaurus and Sinosaurus (formerly Dilophosaurus sinensis) with a speculative crest. Crestless Tachiraptor chasing Laquintasaura up to by Maurilio Oliveira, if I’m right.
Full paper here.