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Waltonortyx bumbanipodiides
Taxonomy
Waltonortyx bumbanipodiides was named by Mayr and Kitchener (2024). Its type specimen is NMS.Z.2021.40.175, a partial skeleton (thoracic vertebra, right coracoid, fragmentary proximal end of right humerus, left phalanx proximalis digiti majoris)), and it is a 3D body fossil. Its type locality is Walton-on-the-Naze Division A2 (NMS), which is in a Ypresian marine horizon in the London Clay Formation of the United Kingdom. It is the type species of Waltonortyx.
Synonymy list
| Year | Name and author |
|---|---|
| 2024 | Waltonortyx bumbanipodiides Mayr and Kitchener p. 6 figs. Figs. 1, 3, 4 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Waltonortyx bumbanipodiides Mayr and Kitchener 2024
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Mayr and A. C. Kitchener 2024 | In addition to the above-listed features
that distinguish the Waltonortygidae, fam. nov. from the Gallinuloididae, Quercymegapodiidae, Paraortygidae, and crown group Galliformes, the new taxon Waltonortyx, gen. nov. is distinguished from Gallinuloides Eastman, 1900, and Paraortygoides Mayr, 2000, in that the crista deltopectoralis is less dorsally extensive. Differs from a coracoid referred to Bumbanipodius by Zelenkov (2021) in that medial surface of processus acrocoracoideus (that is, the facies articularis clavicularis) forming a medial protrusion (flatter in B. magnus), facies articularis humeralis (coracoid) more laterally projected and with more convex outline (in dorsoventral view), and in that cotyla scapularis proportionally smaller. Distinguished from Bumbanortyx Zelenkov, 2021, in that cotyla scapularis (coracoid) with circular outline (ellipsoid in Bumbanortyx) and processus procoracoideus less developed. Differs from Tegulavis Mourer- Chauviré, Bourdon, Duffaud, Le Roux, and Laurent, 2023, in that facies articularis humeralis of coracoid less laterally projected and sternal margin of crista articularis sternalis markedly concave (straight in Tegulavis). Distinguished from Scopelortyx Mourer-Chauviré, Pickford, and Senut, 2015, in that coracoid with more deeply excavated cotyla scapularis, humerus with proximodistally narrower caput humeri, and second (dorsal) fossa pneumotricipitalis shallower. Direct comparisons with the taxon Argillipes are impeded by the lack of overlap in the known elements (only proximal tarsometatarsi and a referred distal humerus are known from A. aurorum, the type species of the taxon), but compared with a specimen that was likened to A. aurorum by Mayr and Smith (2019), the tuberculum dorsale of the humerus is proximodistally shorter and mediolaterally wider, and the caput humeri is proximodistally somewhat longer. Comparisons with Namaortyx Mourer-Chauviré et al., 2011 and Chambiortyx Mourer-Chauviré et al., 2013 are not possible owing to a lack of overlap in the known skeletal elements. |