Mirarce, the most complete North American enantiornithine

[Halichoeres]

The enantiornithines ("opposite birds") are well-known from the Early Cretaceous of China, but they don't preserve well outside of that lagerstätte environment. This paper describes the most complete member of the group known from North America, and names it Mirarce eatoni ("wonderful Arce [winged messenger in Greek mythology]"). Here's a diagram of the known remains (but click through to the paper to see very nice photos of the actual bones).



And a reconstruction by Brian Engh:



The paper is open access: https://peerj.com/articles/5910/

And a very accessible overview by the lead author Jessie Atterholt: https://peerj.com/blog/post/115284881078/the-most-complete-enantiornithine-fossil-peerj-author/