Amazonetta cubensis, Zelenkov, 2025

FIGURE 2. Humeri of various species of Anatidae in caudal view (aligned to the same width of proximal end):A—Amazonetta brasiliensis, specimenAMNH 26189; B—Amazonetta cubensis sp. nov., holotype PIN 5781/40; C, D—Aix sponsa: C, specimen PIN 40-10-1 (Florida), D, specimen PIN 40-10-6 (Cuba); E—Spatula cyanoptera, specimen PIN 40-48-1; F—Spatula discors, specimen PIN 40-47-1; G—Anas laysanensis, specimen PIN 40-307-1. Abbreviations: cdf, crus dorsale fossae; ch, caput humeri; con, concavity in the dorsal surface of the crista deltopectoralis; fpt, fossa pneumotricipitalis; ic, incisura capitis; n, notch in the proximal margin of the bone formed by incisura capitis; shc, impressio m. scapulohumeralis cranialis; td, tuberculum dorsale; tv, tuberculum ventrale. Scale bars are 10 mm.

FIGURE 3. Humeri of various species of Anatidae in cranial view (aligned to the same width of proximal end):A—Amazonetta brasiliensis, specimen AMNH, no. 26189; B—Amazonetta cubensis sp. nov., holotype PIN 5781/40; C, D—Aix sponsa: C, specimen PIN 40-10-1 (Florida), D, specimen PIN 40-10-6 (Cuba); E—Spatula cyanoptera, specimen PIN 40-48-1; F—Spatula discors, specimen PIN 40-47-1. Abbreviations: acd, dorsally protruding apex of the crista deltopectoralis; cpb, location of the distal end of the crista deltopectoralis relative to the distal end of the crista bicipitalis; cd, condylus dorsalis; cv, condylus ventralis; ed, epicondylus dorsalis; imp, impressio m. pectoralis; n, notch in the proximal margin of the bone formed by incisura capitis; pf, processus flexorius; st, sulcus transversus; tsv, tuberculum supracondylare ventrale; arrow indicates a dorsoventrally elongate “step” in the proximal edge of the bone formed by incisura capitis. Scale bars are 10 mm.

FIGURE 4. Humeri of various species of Anatidae in dorsal view: A—Amazonetta brasiliensis, specimen AMNH 26189; B— Amazonetta cubensis sp. nov., holotype PIN 5781/40; C, D—Aix sponsa: C, specimen PIN 40-10-1 (Florida), D, specimen PIN 40-10-6 (Cuba); E—Spatula cyanoptera, specimen PIN 40-48-1. Abbreviations: shc, impressio m. scapulohumeralis cranialis; arrow indicates a gently diverging proximal wall of the crista deltopectoralis in A. sponsa. Scale bars are 10 mm.