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FIGURE 1. Phylogram of charadriiform relationships showing calibrated nodes 1-7 (modified from Baker et al., 2007, figure 1). Numbered nodes in red correspond to the following calibrations: (1) divergence of Charadriiformes from its nearest outgroup; (2) divergence of Charadrii from other Charadriiformes; (3) divergence of Burhinidae from Chionis and Pluvianellus; (4) divergence of Jacanidae from other Scolopaci; (5) basal divergence among Calidridinae; (6) divergence of Turnicidae from Lari; (7) basal divergence of Laromorphae; (8) divergence of Alcidae from Stercorariidae.

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FIGURE 2. Phylogram of alcid relationships showing calibrated nodes 7-15 (modified from Smith, 2011a, figure 1.26). Numbered nodes in red correspond to the following calibrations: (8) divergence of Alcidae from Stercorariidae; (9) divergence of Aethiini from Fraterculini; (10) divergence of Fratercula arctica from Fratercula corniculata; (11) divergence of Cepphus carbo from Cepphus columba; (12) divergence of Synthliboramphus hypoleucus from Synthliboramphus craveri; (13) divergence of Brachyramphus marmoratus from Brachyramphus brevirostris; (14) divergence of Alle alle from Uria; (15) divergence of Uria lomvia from Uria aalge; (16) divergence of Alca torda from Pinguinus impennis.

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