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Proamphiuma cretacea
Taxonomy
Proamphiuma cretacea was named by Estes (1969). It is a 3D body fossil.
It was considered a nomen dubium by Rieppel and Grande (1998).
It was considered a nomen dubium by Rieppel and Grande (1998).
Synonymy list
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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.
†Proamphiuma cretacea Estes 1969
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. D. Gardner 2003 | Genus and species of Amphiumidae primitively differing from Amphiuma in having trunk vertebrae with neural crest relatively lower, subcentral keel relatively shallower, and anterior basapophyses relatively shorter with distal end in line with or behind anterior cotylar rim and in having trunk vertebrae and anterior caudals with postzygapophyseal crests relatively lower. Differs further from extant species of Amphiuma (conditions uncertain for late Paleocene A. jepseni) as follows: more derived in having atlas with indistinct postzygapophyseal processes, trunk vertebrae with vertebrarterial canal closed posteriorly, and anterior caudals pierced by spinal foramen; more primitive in having atlas with ventral rims of anterior and posterior cotyles approximately in line, postatlantal vertebrae with neural crest extending anteriorly almost to leading edge of neural arch roof, and trunk vertebrae with leading edge of neural crest inclined posteriorly at shallower angle; and in one character state of uncertain polarity, namely neural crest on inferred middle trunk vertebrae broadly rounded anteriorly and dorsal edge horizontal in lateral profile. |
Measurements
No measurements are available
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| Source: s = species, subo = suborder, c = class, subp = subphylum | |||||
| References: Carroll 1988, Bryant 1989, Hendy et al. 2009, Uhen 2004 | |||||
Age range: base of the Late/Upper Maastrichtian to the top of the Puercan or 70.60000 to 63.30000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Maastrichtian | USA (North Dakota) | Proamphiuma cretacea (45144) | |
| Late/Upper Maastrichtian | USA (Montana) | Proamphiuma cretacea (13142) | |
| Puercan | USA (Montana) | Proamphiuma cretacea (14666 14798) |