FIGURE 1. Distal left tibiotarsi of Daphoenositta trevorworthyi sp. nov. QM F57897 ( 1, 3, 5) compared with that of Da. chrysoptera AM.O.64965 ( 2, 4, 6). 1-2, cranial aspect; 3-4, caudal aspect; 5-6, lateral aspect. Abbreviations: cl, condylus lateralis; cm, condylus medialis; em, epicondylus medialis; lrf, lateral bony ridge of retinaculum m. fibularis; mrf, medial bony ridge of retinaculum m. fibularis; ps, pons supratendineus; rct, ridge on trochlea cartilaginis tibialis; trel, tuberositas retinaculi extensoris lateralis; trem, tuberositas retinaculi extensoris medialis. Arrows indicate scratch marks. Scale bar equals 2 mm.

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FIGURE 2. Distal left tibiotarsus of Cormobates sp. QM F57898 ( 1, 3, 5) compared with that of Cormobates leucophaea AM.O.60025 ( 2, 4, 6). 1-2, cranial aspect; 3-4, caudal aspect; 5-6, lateral aspect. Abbreviations: cl, condylus lateralis; em, epicondylus medialis; lrf, lateral bony ridge of retinaculum m. fibularis; mrf, medial bony ridge of retinaculum m. fibularis; ps, pons supratendineus; rct, ridge on trochlea cartilaginis tibialis; rim, thickened rim of the condylus lateralis; trel, tuberositas retinaculi extensoris lateralis; trem, tuberositas retinaculi extensoris medialis. Scale bar equals 2 mm.

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FIGURE 3. Distal left tibiotarsus of Climacteris sp. QM F36276 ( 1, 3, 5) compared with that of Climacteris picumnus AM O.64841 ( 2, 4, 6). 1-2,cranial aspect; 3-4, caudal aspect; 5-6, lateral aspect. Abbreviations: cl, condylus lateralis; em, epicondylus medialis; lrf, lateral bony ridge of retinaculum m. fibularis; mrf, medial bony ridge of retinaculum m. fibularis; ps, pons supratendineus; rct, ridge on trochlea cartilaginis tibialis; rim, thickened rim of the condylus lateralis; trel, tuberositas retinaculi extensoris lateralis; trem, tuberositas retinaculi extensoris medialis. Scale bar equals 2 mm.

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FIGURE 4. Comparison of fossil tibiotarsi of Daphoenositta trevorworthyi sp. nov. QM F57897 ( 1, 4), Cormobates sp. QM F57898 ( 2, 5) and Climacteris sp. QM F36276 ( 3, 6). 1-3, cranial aspect; 3-6, lateral aspect. Characteristic features are as follows: a, pons supratendineus situated proximally of the condylus medialis by a distance about equal to one-third of the length of this condyle; b , sulcus extensorius narrow; c, bony ridges for attachment of retinaculum m. fibularis located disto-laterally of the tuberositas retinaculi extensoris lateralis; d, pons supratendineus situated proximally of condylus medialis by a distance greater than 50% of the length of this condyle; e, bony ridges for retinaculum m. fibularis long and prominent; f, condyles short and set widely apart; g, bony ridges for retinaculum m. fibularis long and low; h, condylus lateralis circular in shape; i, medial bony ridge for retinaculum m. fibularis short; j, thickened rim on condylus lateralis. Scale bar equals 2 mm.

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