Figure 1Morphology of Eofringillirostrum (A) Photograph and (B) line drawing of the holotype skeleton of Eofringillirostrum boudreauxi (FMNH PA 793) with enlargements showing details of the (C) skull and (D) foot, and (E) line drawing of foot. (F) Holotype slab (IRSNB Av 128a) and (G) counterslab (IRSNB Av 128b) of Eofringillirostrum parvulum with enlargements showing details of (H) skull and (I) carpometacarpus; for contrast enhancement, the specimen was coated with ammonium chloride. Abbreviations: at: accessory trochlea, br: base of the main body of fourth metatarsal trochlea (articular end broken off); d-I – d-IV: pedal digits I – IV, dvf: distal vascular foramen, ext: extensor process, int: intermetacarpal process, ot: ossified tendon, py: pygostyle, rp: retroarticular process, sup: dorsal supracondylar process, tr: tracheal rings. Arrows in (D) indicate borders of intermetacarpal process. Grey shaded regions in (B) indicate portions of the carpometacarpus that were displaced during splitting of the slab. See also Figure S2.