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Phosphorosaurus ponpetelegans
Taxonomy
Phosphorosaurus ponpetelegans was named by Konishi et al. (2016). Its type specimen is HMG-1528, a partial skeleton, and it is a 3D body fossil. Its type locality is Pankerusano-sawa Creek (Locality A), which is in a Maastrichtian marine carbonate in the Hakobuchi Formation of Japan.
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Phosphorosaurus ponpetelegans Konishi et al. p. 812 |
| 2019 | Phosphorosaurus ponpetelegans Driscoll et al. |
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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.
†Phosphorosaurus ponpetelegans Konishi et al. 2016
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Konishi et al. 2016 | The new species is chiefly distinguished from the other members of Halisaurinae as follows. From Hali- saurus platyspondylus: prefrontal postnarial medial lam- ina small; development of prefrontal supraorbital tuberosity minimal; frontal preorbital borders each mak- ing a tight, inward ‘step’ and extending anteriorly as narrowly spaced and sub-parallel borders; parietal fora- men separated from frontal by distance equal to half its diameter; quadrate stapedial meatus parallel-sided;
supraoccipital not reaching level of skull roof dorsally. From H. arambourgi: paired anteriorly diverging ridges on dorsal frontal surface absent; frontal preorbital borders each making a tight inward ‘step’ before extending anteri- orly as narrowly spaced and sub-parallel borders; dorsal rim of parietal foramen not elevated; frontoparietal suture shallowly sinusoidal; postorbital processes of parie- tal distally expanded; quadrate stapedial meatus parallel- sided; free dorsal surangular border becoming elevated to meet coronoid, not straight horizontally. From Phosphor- osaurus ortliebi: prefrontal postnarial medial lamina small; development of prefrontal supraorbital tuberosity minimal; median dorsal ridge of frontal becoming weak posterior to orbits; parietal foramen separated from frontal by distance equal to half its diameter, not invading the frontal; parietal table surface smooth posterior to foramen; fronto-parietal suture shallowly sinusoidal. From Eonata- tor sternbergii: frontal preorbital borders each making a tight inward ‘step’ before extending anteriorly as narrowly spaced and sub-parallel borders; parietal foramen sepa- rated from frontal by distance equal to half its diameter; posteromedial projection of parietal table at parietal notch absent; posterior margin of infrastapedial process not pro- truding posteriorly beyond distal end of suprastapedial process; free dorsal surangular border shallowly concave, not sinusoid; posterior rim of glenoid fossa taller than anterior counterpart. From E. coellensis: frontal preorbital borders each making a tight inward ‘step’ before extend- ing anteriorly as narrowly spaced and sub-parallel borders (Paramo-Fonseca 2013). The new species also possesses the following autapomorphic characters (note: some char- acters are simply not preserved in any other known hali- saurine specimen and hence are possible autapomorphies, indicated in italics): maxilla posterior terminus situated at same level as anterior wall of orbit, lacking suborbital maxillary teeth; prefrontal anterior process forming virtu- ally entire lateral border of external naris; palatine choa- nal border thick as remainder of palatine basin; short, dorsally arching alar process projecting laterally at pos- terolateral corner of palatine, forming roof of posterior alveolar canal; postorbitofrontal jugal process long and stalk-like, projecting laterally forming shallow angle from horizontal; the process distally bearing ventrally facing depression for jugal articulation; prootic parietal process (crista alaris) subequal in length to suspensorial process; and lateral suture between surangular and articular angular. |
Measurements
No measurements are available
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| Source: f = family, c = class, subp = subphylum, uc = unranked clade | |||||
| References: Gervais 1852, Hendy et al. 2009, Carroll 1988 | |||||
Age range: Early/Lower Maastrichtian or 70.60000 to 66.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Maastrichtian | Japan | Phosphorosaurus ponpetelegans (type locality: 194131) |