Songzia heidangkouensis (LianHai 1990, Wang et al. 2012; Early Eocene) was considered a gruiform (crane relative), but here nests with the nearly identical, but larger Crex, the corn crake. Note the free posterior processes of the premaxilla, as in Crex.

Crex crex (Linneaus 1758, 11-45cm long) is the extant corn crake, a bird derived from rails, nesting with Songzia.

LianHai H 1990. An Eocene bird from Songzi, Hubei province. Vertebrata PalAsiatica 28(1):34-42.

Linnaeus C 1758. Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata.

Wang M, Mayr G, Zhang J and Zhou A 2012. Two New Skeletons of the Enigmatic, Rail-like Avian Taxon Songzia Hou, 1990 (Songziidae) from the Early Eocene of China. Alcheringa 36: 487-499.

wiki/Crex
wiki/Songzia