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Yangtzepus clarkei
Taxonomy
Yangtzepus clarkei was named by Salisbury et al. (2016). It is considered to be a form taxon. Its type specimen is WAM 12.1.1, replica of UQL-DP57-1, a footprint, and it is a trace fossil. Its type locality is UQL-DP57 tracksite (PROXY), which is in a Valanginian/Barremian delta plain sandstone in the Broome Sandstone Formation of Australia.
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Yangtzepus clarkei Salisbury et al. p. 34 |
| 2023 | Yangtzepus clarkei Poropat et al. p. 177 |
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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.
†Yangtzepus clarkei Salisbury et al. 2016
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. W. Salisbury et al. 2016 | Pedal tracks: medium- to large-sized (proximodistal length 24–32.9 cm, mediolateral width 19.7–20.5 cm), tridactyl, mesaxonic (digital impression extension to track length ratio 0.36), longer than wide, with an average maximum length to maximum width ratio of approximately 1.2–1.6; individual digital impressions proportionately elongated and broad, with the impression of digit III being the broadest impression (maximum digital impression width to track length ratio 0.20–0.33), with similar widths for the impressions of digits II (0.16–0.23) and IV (0.16–0.18); impression of digit III is the longest (basal digital impression length 61–81% of total track length), and the impression of digit II extends farther distally than digit IV relative to the principal track axis; axes of the impressions of digits III and IV typically intersect distal to the intersection of the axes of the impressions of digits II and III; total divarication angle between the axes of the impressions of digits II and IV 30–34°; divarication of the axes of the impressions of digits III and IV (20–23°) greater than divarication of axes of the impressions of digits II and III (10–11°); the distance between the proximal margin of each digital impression and the metatarsodigital pad impression is greatest for the impression of digit III, then II, and the least for IV; possible digital pad formula 3/II, 2/III, 3/IV, with the pad impressions associated with the impression of digit IV being variably impressed; impression of ungual present distally on the impression of digit II; a separate, circular metatarsodigital pad impression occurs immediately proximal to the proximal end of the impression of digit IV and in line with the principal track axis, with a width that is approximately equivalent to the width of the impression of digit III; impression of the hallux absent. |
Measurements
No measurements are available
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| Source: o = order | |||||
| References: Marsh 1875, Kiessling 2004 | |||||
Age range: base of the Valanginian to the top of the Barremian or 137.05000 to 121.40000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Valanginian - Barremian | Australia (Western Australia) | Yangtzepus clarkei (type locality: 185866 185867) |