Archaeopteryx (Jurapteryx) recurva (JM2257; the Eichstätt specimen; Howgate 1985) is one of the smaller Solnhofen birds. Here it nests as the last common ancestor of all extant birds. A gap spanning the entire Cretaceous separates this taxon from extant taxa and their kin. As in other bird lines, the loss of tail length, the fusion of the pygostyle and the fusion of manus elements are convergent.

Serikornis sungei (Lefèvre et al. 2017; Late Jurassic; 50cm long) was originally considered a pre-bird sister to Eosinopteryx. Here it nests with Jurapteryx, the Eichstätt specimen first attributed to Archaeopteryx. Serikornis is larger than its sister, had larger teeth and was flightless. More details at PterosaurHeresies.

Howgate ME 1985. Problems of the osteology of Archaeopteryx: is the Eichstätt specimen a distinct genus?. In Hecht, Ostrom, Viohl, and Wellnhofer (eds.), The Beginnings of Birds: Proceedings of the International Archaeopteryx Conference, Eichstätt 1984. Freunde des Jura-Museums Eichstätt, Eichstätt 105-112. 

Lefèvre U, Cau A, Cincotta A, Hu D-Y, Chinsamy A, Escuillié F and Godefroit P 2017. A new Jurassic theropod from China documents a transitional step in the macrostructure of feathers. Sci Nat 104:74. DOI 10.1007/s00114-017-1496-y

wiki/Jurapteryx
wiki/Serikornis