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Saurodesmus robertsoni
Taxonomy
Saurodesmus robertsoni was named by Seeley (1891). Its type specimen is NHMUK PV OR 28877, almost complete right femur, a limb element, and it is a 3D body fossil. Its type locality is Linksfield, which is in a Jurassic marine mixed carbonate-siliciclastic in the United Kingdom.
It was considered a nomen dubium by Joyce (2017).
It was considered a nomen dubium by Joyce (2017).
Synonymy list
| Year | Name and author |
|---|---|
| 1891 | Saurodesmus robertsoni Seeley p. 166 figs. 1-6 |
| 2024 | Saurodesmus robertsoni Szczygielski et al. |
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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.
†Saurodesmus robertsoni Seeley 1891
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. G. Seeley 1891 | NHMUK PV OR 28877 can be distinguished from all other non-mammaliaform and early mammaliaform cynodonts by the following combination of femoral features: comparatively short diaphysis, lateromedially expanded proximal and distal regions, well-developed trochanters, proximodistally long and laterally flaring greater trochanter, lesser trochanter mostly medially projected and proximally placed but well-separated from the femoral head, intertrochanteric and adductor fossa separated by a poorly-developed intertrochanteric crest, well-developed medial epicondyle, medial (tibial) and lateral (fibular) condyles similar sized in ventral aspect, a distinct dorsal eminence proximal to the medial (tibial) condyle located close to the level of the long axis of the femoral shaft and almost in the middle of the width of the distal expansion, pocket-like fossa proximal to the medial (tibial) condyle ventrally, “semicolon-shaped” distal articular surface. | |
| T. Szczygielski et al. 2024 | NHMUK PV OR 28877 can be distinguished from all other non-mammaliaform and early mammaliaform cynodonts by the following combination of femoral features: comparatively short diaphysis, lateromedially expanded proximal and distal regions, well-developed trochanters, proximodistally long and laterally flaring greater trochanter, lesser trochanter mostly medially projected and proximally placed but well-separated from the femoral head, intertrochanteric and adductor fossa separated by a poorly-developed intertrochanteric crest, well-developed medial epicondyle, medial (tibial) and lateral (fibular) condyles similar sized in ventral aspect, a distinct dorsal eminence proximal to the medial (tibial) condyle located close to the level of the long axis of the femoral shaft and almost in the middle of the width of the distal expansion, pocket-like fossa proximal to the medial (tibial) condyle ventrally, “semicolon-shaped” distal articular surface. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||
Age range: Late/Upper Jurassic or 161.50000 to 145.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Jurassic | United Kingdom (Scotland) | Chelonia indet. (type locality: 105332) |