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Utatsusaurus
Taxonomy
Utatsusaurus was named by Shikama and Kamei (1978) [Sepkoski's age data: Tr Olen-u Sepkoski's reference number: 746]. Its type is Utatsusaurus hataii. It was considered monophyletic by Motani (1999).
It was assigned to Omphalosauridae by Shikama and Kamei (1978); to Ichthyopterygia by Motani (1999), Sander (2000); to Ichthyosauria by Motani et al. (1998), Maisch and Matzke (2000), Sepkoski (2002); to Utatsusauridae by McGowan and Motani (2003), Maisch (2010); and to Grippoidea by Ji et al. (2016).
It was assigned to Omphalosauridae by Shikama and Kamei (1978); to Ichthyopterygia by Motani (1999), Sander (2000); to Ichthyosauria by Motani et al. (1998), Maisch and Matzke (2000), Sepkoski (2002); to Utatsusauridae by McGowan and Motani (2003), Maisch (2010); and to Grippoidea by Ji et al. (2016).
Species
U. hataii (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1978 | Utatsusaurus Shikama and Kamei p. 83 figs. Plates. 1-9; Figs. 6-12 |
| 1998 | Utatsusaurus Motani et al. p. 255 |
| 1999 | Utatsusaurus Motani fig. 1 |
| 2000 | Utatsusaurus Maisch and Matzke p. 94 |
| 2000 | Utatsusaurus Sander |
| 2002 | Utatsusaurus Sepkoski |
| 2003 | Utatsusaurus McGowan and Motani |
| 2010 | Utatsusaurus Maisch |
| 2016 | Utatsusaurus Ji et al. 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.
G. †Utatsusaurus Shikama and Kamei 1978
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†Utatsusaurus hataii Shikama and Kamei 1978
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. W. Maisch and A. T. Matzke 2000 | "Small ichthyosaur with moderately slender snout, teeth isodontous, conical, mesiodistally flattened, prefrontal with anterolateral lamina reaching into orbit, prefrontal and postfrontal separate, interclavicle with heart-shaped anterior end and long posterior stylus, two well-developed sacral ribs retained, ilium strongly expanded distally." |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Griesbachian - Smithian | Canada (British Columbia) | U. sp. (196982) | |
| Smithian | Canada (British Columbia) | U. sp. (127262) | |
| Olenekian | Japan (Miyagi) | U. hataii (87146) | |
| Spathian | Japan (Miyagi) | U. hataii (90374) | |
| Spathian | USA (Nevada) | U. sp. (195195) |