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Neognathae incertae sedis (GPIT-PV-122865). Tarsometatarsus in A, B, dorsal view; C, D, plantar view; E, F, cross-section of the proximal end of the shaft; G, H, distal view; I, J, enlargement of the distal end in dorsal view; K, L, enlargement of the distal end in plantar view. Abbreviations: bw, bone wall; fmt1, fossa metatarsi 1; fvd, foramen vasculare distale; mt, metatarsale; se, sulcus extensorius; tm, trochlea metatarsi. Scale bar ¼ 5 mm.
Source publication
Knowledge of the Palaeogene avifauna of East Asia is scarce, and only a few fossils have been described thus far. A tarsometatarsus from the upper Eocene Na Duong Basin represents the first Palaeogene fossil bird from Vietnam. The fossiliferous sediments in the Na Duong Basin originated from an aquatic ecosystem but also yielded terrestrial animal...
Contexts in source publication
Context 1
... Linnaeus, 1758 Neognathae incertae sedis (Fig. 2) Referred material. GPIT-PV-122865, a partial right ...
Context 2
... GPIT-PV-122865 represents the distal part of a right tarsometatarsus with a shaft approximately covering half to two-third of its original length (Fig. 2). Distal width ¼ 15.2 mm; trochlea metatarsi III width ¼ 5.0 mm; shaft width ¼ 8.3 mm; foramen vasculare distale length ¼ 1.5 mm. Diagenetic compression has flattened the bone dorsoplantarly, and both its plantar surface and the dorsal surface of the distal end are ...
Context 3
... shaft is elongate with an equal width over the preserved length, but it is much wider than the trochlea metatarsi III. In dorsal view ( Fig. 2A, B), GPIT-PV-122865 has a deep sulcus extensorius that is proximally bordered by prominent ridges; the shaft becomes flat and smooth towards the distal one-third of the bone (see Supplementary Data 1). On the plantar surface (Fig. 2C, D), a sulcus is bordered by a prominent latera ridge. The fossa metatarsi I is situated on the plantar ...
Context 4
... an equal width over the preserved length, but it is much wider than the trochlea metatarsi III. In dorsal view ( Fig. 2A, B), GPIT-PV-122865 has a deep sulcus extensorius that is proximally bordered by prominent ridges; the shaft becomes flat and smooth towards the distal one-third of the bone (see Supplementary Data 1). On the plantar surface (Fig. 2C, D), a sulcus is bordered by a prominent latera ridge. The fossa metatarsi I is situated on the plantar surface medial to the midline of the bone, and appears to be oval in outline but is poorly preserved (Fig. 2K, ...
Context 5
... ridges; the shaft becomes flat and smooth towards the distal one-third of the bone (see Supplementary Data 1). On the plantar surface (Fig. 2C, D), a sulcus is bordered by a prominent latera ridge. The fossa metatarsi I is situated on the plantar surface medial to the midline of the bone, and appears to be oval in outline but is poorly preserved (Fig. 2K, ...
Context 6
... separated by a large furrow, which is likely to be a taphonomic artefact. The trochlea metatarsi IV is mediolaterally broad, but its distal portion is damaged. It also lacks a distinct trochlear furrow on the preserved surface and appears to be slightly larger than the other trochleae ( Fig. 2G-L, S1). The bone wall is thick in cross-section (Fig. 2E, ...
