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Stemec
Taxonomy
Stemec was named by Kaiser et al. (2015). Its type is Stemec suntokum.
It was assigned to Plotopteridae by Kaiser et al. (2015).
It was assigned to Plotopteridae by Kaiser et al. (2015).
Species
S. suntokum (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Stemec Kaiser et al. p. 9 figs. Figures 1-3 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Kaiser et al. 2015 | Stemec differs from most other plotopterids in its small size. Only Plo- topterum joaquinensis Howard, 1969 is a plo- topterid of similar size. Stemec differs from Plotopterum in the following features: the FAHU is a raised, flat platform, omal to the procoracoid with clearly demarcated lateral and sternal margins that are strongly elevated from the shaft (in Plo- topterum, the FAHU is not raised from the shaft; Figure 3.1, 3.2); and the sulcus m. supracoracoidei forms a shallow depression pointing omally (Figure 3.4), but does not become the prominent, steep- walled groove seen in Plotopterum (Figure 3.3). Apart from much smaller size, Stemec differs from larger plotopterids in: the FAHU lies omal to the procoracoid (in Copepteryx and Tonsala, the FAHU extends beyond the procoracoid); the shaft widens more gradually towards the sternal articulation (Figure 1) than in Copepteryx and Hokkaidornis (see Olson and Hasegawa, 1996; Sakurai et al., 2008); the facies articularis sternalis faces rela- tively medially (in Copepteryx and Hokkaidornis, it is almost perpendicular to shaft in dorsal view); and the facies interna is wide omo-sternally with the omo-dorsal lip lying omal to the crista intermedia (Figures 1.1, 2.3) (in Copepteryx and Hokkaidornis, the facies interna is restricted near the crista inter- media). |
Measurements
No measurements are available
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| Source: f = family, subo = suborder, o = order | |||||
| References: Marsh 1875, Benton 1983, Bush and Bambach 2015 | |||||