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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Ischyodus rayhaasi
Taxonomy
Ischyodus rayhaasi was named by Hoganson and Erickson (2005). Its type specimen is ND 99-6.1, a set of teeth (tooth plate), and it is a 3D body fossil. Its type locality is NDSFC Loc. LO64, Logan County (NDGS L140 general), which is in a Maastrichtian paralic sandstone in the Fox Hills Formation of North Dakota.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2005 | Ischyodus rayhaasi Hoganson and Erickson p. 715 figs. 3; Pl. 1:1–12 |
| 2019 | Ischyodus rayhaasi Hoganson et al. p. 47 figs. 9.37, 9.38 |
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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.
†Ischyodus rayhaasi Hoganson and Erickson 2005
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Hoganson and J. M. Erickson 2005 | A species of Ischyodus that differs from all other species in this genus by several mandibular tooth plate and palatine tooth plate characteristics. Mandibular tooth plate characteristic unique to this species is the unequally bifurcate median tritor in which the tip of the outer branch lies directly posterior to the anterior outer tritor and the inner branch extends beyond the anterior tip of the anterior outer tritor. The presence of an indistinct accessory median tritor is also unique to this species. Palatine tooth plate characteristics that differentiate this species from other Ischyodus species include the elongate median tritor that extends beyond the posterior inner tritor and the distinctly curved, elongate outer tritor. |
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Carroll 1988, Wagner 2023, Hendy et al. 2009 | |||||
Age range: Late/Upper Maastrichtian or 70.60000 to 66.00000 Ma
Collections (11 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Maastrichtian | USA (South Dakota) | Ischyodus rayhaasi (179296) | |
| Late/Upper Maastrichtian | USA (North Dakota) | Ischyodus rayhaasi (179280 179282 179284 179285 179286 179287 179288 179295 213583 type locality: 213589) |