Wing skeleton of X. xympithecus compared with Eudocimus albus and Apteribis glenos. (a) Left carpometacarpus (USNM 543067) in cranial view, (b) dorsal view, (c) ventral view and (d) caudal view. (e) Major metacarpal (USNM 543074) sectioned at midlength (note the greatly thickened anterior wall). (f) Radiograph of carpometacarpus of Eudocimus compared with (g) Xenicibis (USNM 543067). (h) Composite left wing of Xenicibis (USNM 543067-543073) compared with (i) Eudocimus (USNM 266467) and (j) Apteribis.
