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Acipenser amnisinferos
Taxonomy
Acipenser amnisinferos was named by Hilton and Grande (2022). Its type specimen is FMNH PF17629, a skeleton ( skull, pectoral girdle, anterior scutes (crushed and partially disarticulated) exposed in left lateral view.), and it is a 3D body fossil. Its type locality is Tanis, which is in a Maastrichtian terrestrial sandstone in the Hell Creek Formation of North Dakota.
Synonymy list
| Year | Name and author |
|---|---|
| 2022 | Acipenser amnisinferos Hilton and Grande p. 29 figs. 18-20 |
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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.
†Acipenser amnisinferos Hilton and Grande 2022
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. J. Hilton and L. Grande 2022 | An acipenserid that differs from all other known species by an elongate snout (∼57% head length). The only other sturgeon taxon with a snout of this relative length is the extant species Acipenser stellatus from the Black and Caspian
seas and their tributaries, which has a snout 51–68% head length (Hilton et al., 2022). Although these two taxa overlap in relative snout lengths, adult or large subadult specimens of A. stellatus (i.e., >1 m standard length) have a snout length that is an average of 61% head length (n = 38; Hilton, unpublished data). Also, the dorsal dermal skull bones of A. stellatus bear small ridges or thorns at their centers of origins; these are lacking in †A. amnisinferos n. sp., and there is no indication that this is due to preservation (e.g., broken bases of spines; see Hilton et al., 2022, figs. 5–7 for condition in A. stellatus). |
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||
Age range: Maastrichtian or 72.20000 to 66.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Maastrichtian | USA (North Dakota) | Acipenser amnisinferos (type locality: 227364) |