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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Acipenser praeparatorum
Discussion
Preserved portion of the individual measures 89 cm. Total length is estimated to have been 120 cm.
Taxonomy
Acipenser praeparatorum was named by Hilton and Grande (2022). Its type specimen is FMNH PF17608, a skeleton (Body fossil specimen with skull, pectoral girdle and fin, and dorsal, lateral, and ventral scute rows of the anterior portion of the body exposed in lateral vie), 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 praeparatorum Hilton and Grande p. 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.
†Acipenser praeparatorum 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 in having an extremely narrow and elongate dorsal branchiostegal that lacks superficial ornamentation. The dorsalmost branchiostegal of other species of Acipenser, Huso, and Pseudoscaphirhynchus is relatively elongate and tall (e.g., Acipenser brevirostrum Lesueur, 1818; Hilton et al., 2011, figs. 47–51), in contrast to the triangular condition found in Scaphirhynchus. The height-to-width ratio of the branchiostegal in †Acipenser praeparatorum n. sp. is much greater than in other acipenserid taxa (e.g., ∼3.0 vs. 2.4 as shown in A. brevirostrum in Hilton et al., 2011, fig. 48). Other acipenserids also have ornamentation on the superficial surface of the ventral end of the dorsalmost branchiostegal |
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 72.10000 to 66.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Maastrichtian | USA (North Dakota) | Acipenser praeparatorum (type locality: 227364) |