Table 1.

Measurements of the Yixianornis grabaui holotype specimen (in cm)

Skull
Premaxilla length along facial margin	0.84
Edentulous portion of premaxilla along facial margin	0.33
Dentary length, total; from anterior tip to fork of dorsal and ventral processes	3.2, 1.4
Dentary dorsoventral height at anterior tip	0.2
Vertebral column
Thoracic vertebra average length	0.58
Sacrum length	2.5
Pectoral girdle
Sternum length on midline	4.31
Sternal fenestra maximum mediolateral diameter	0.5
Scapula maximum length, breadth just distal to glenoid facet	4.81, 0.35
Coracoid height, sternal margin length	2.33, 1.53
Coracoidal lateral process length	0.3
Furcula: length clavicular ramus (right)	2.05
Furcula distance between rami just dorsal to apopophysis	0.42
Furcula shaft diameter at apopophysis	0.22
Pectoral limb
Humerus maximum length	4.93
Radius length, midshaft width	4.8, 0.26
Ulna length, midshaft width	5.03, 0.32
Carpometacarpus maximum length	2.56
Metacarpal I length	0.46
Metacarpal III width	0.09
Metacarpal II width	0.28
Phalanx length I:1, I.2	1.08, 0.61
Phalanx II:1, II:2, II.3	1.25, 1.23, 0.5
Phalanx III:1	0.6
Pelvic girdle
Ilium length total, preacetabular, postacetabular	2.35, 1.2, 1.15
Ischium length (estimated)	2.05
Pubis length, average shaft diameter, symphysis length	4.22 est., 0.11, 0.66
Pelvic limb
Femur maximum length, midshaft width	4.10, 0.42
Tibia maximum length, not including cnemial crest	5.28, 5.26
Tarsometatarsus maximum length	2.7
Pedal phalanx I:1 length	0.78
Pedal phalanx II:1, II:2	1.13, 0.94
Pedal phalanx III:1, III:2, III:3	1.15, 0.87, 0.83
Pedal phalanx IV:1, IV:2, IV:3, IV:4	1.25, 0.58, 0.56, 0.62
Feathers
Rectrices: longest, shortest	9.2 est., 7.5 est.
Remiges: right side, maximum length distal primaries (9 & 8?)	6.7 est.
Remiges: left side, maximum length proximal primary (1–5?)	5.6 est.