Figure 1 from: Smith N (2011) Taxonomic revision and phylogenetic analysis of the flightless Mancallinae (Aves, Pan-Alcidae). ZooKeys 91: 1-116. https://doi.org/10.3897/zookeys.91.709

Figure 1 - Comparison of alcid humeri in posterior view. Previously recognized Mancallinae holotype humeri along with examples of Pinguinus impennis and volant Alca torda humeri for comparison (dotted lines represent reconstructed parts of humeri). A Holotype specimen of Mancalla californiensis (USNM 4976) B Holotype humerus of Mancalla cedrosensis (LACM 15373) C Holotype specimen of Miomancalla wetmorei (LACM 42653) D Pinguinus impennis (USNM 623465) E Alca torda (NCSM 20058). Anatomical abbreviations: cg capital groove d deltopectoral crest dsp dorsal supracondylar process fp flexor process pf1 primary pneumotricipital fossa sc supracoracoidal crest.