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Wintonopus middletonae
Taxonomy
Wintonopus middletonae was named by Salisbury et al. (2016). It is considered to be a form taxon. Its type specimen is WAM 12.1.15, cast of UQL-DP14-7, a footprint, and it is a trace fossil. Its type locality is UQL-DP14 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 | Wintonopus middletonae Salisbury et al. p. 80–81 |
| 2019 | Wintonopus middletonae Bell et al. p. 2 |
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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.
†Wintonopus middletonae Salisbury et al. 2016
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. W. Salisbury et al. 2016 | Pedal tracks: small- to medium-sized (proximodistal length 19–25 cm, mediolateral width 28–36.6 cm), tridactyl, mesaxonic (digital impression extension to track length ratio 0.3–37), wider than long, with an average maximum length to maximum width ratio approximately 0.7–0.8; individual digital impressions moderately elongated, broad, and generally oval in shape (the maximum width of each digital impression is 36–45% of the total track length, the latter measured along the principal track axis). The apex of the digital impression is typically rounded. The central digital impression (digit III) usually extends distally beyond the impressions of digits II and IV (relative to the principal track axis) by about a third of the track length; the impression of digit IV extends slightly farther proximally than that of digital impression II; axes of the impressions of digits II and III typically intersect distal to the intersection of the axes of the impressions of digits III and IV in large tracks, and at roughly the same position for smaller tracks; total divarication of the axes of impressions of digits II and IV is narrow (82–92°), as is the divarication of axes of impressions of digits II and III (27–47°) and digits III and IV (47–55°); single digital pad impressions of each digital impression may be present, with the formula of 1/II, 1/III, 1/IV; a metatarsodigital pad impression is absent, such that the proximal track margin is typically bilobed, with each lobe representing the proximal margins of the digital impressions of II and IV. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Benton 1983 | |||||
Age range: base of the Valanginian to the top of the Barremian or 139.80000 to 125.00000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Valanginian - Barremian | Australia (Western Australia) | Wintonopus middletonae (185873 type locality: 185874 185875) |