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Sauropithecoides charisticus
Taxonomy
Polychrus charisticus was named by Smith (2006). Its type specimen is PTRM 1841, a maxilla, and it is a 3D body fossil. Its type locality is Medicine Pole Hills, which is in a Chadronian channel sandstone in the Chadron Formation of North Dakota. It is the type species of Sauropithecoides.
It was recombined as Sauropithecoides charisticus by Smith (2011).
It was recombined as Sauropithecoides charisticus by Smith (2011).
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.
†Sauropithecoides charisticus Smith 2006
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| K. T. Smith 2011 | An iguanid similar to (most) living Polychrus
in the following derived features: broad, polygonal rugosities cover all dorsally facing dermal skull bones; multiple anterior premaxillary foramina, colinearly arrayed parallel to jaw parapet; nasal process of premaxilla broadly expanded, strongly overlapping premaxillary process of maxilla; premaxillary process elongate, with strong crista lateralis that slightly overhangs tooth row; slight overhang of premaxillary process by anterior margin of facial process; tooth crowns striated; and low and square coronoid process of coronoid. Differs from (most) living Polychrus in having the following plesiomorphies: seven or fewer premaxillary teeth; foramen present in prefrontal just anterior to frontal facet in paranasal recess; lacrimal broadly exposed along orbital margin (also in P. femoralis); postfrontal discrete; postorbital without strong canthal crest; and nuchal fossa on posterior margin of parietal exposed dorsally and bounded ventrally by long, sharp-edged crest. Additionally differs from all species of Polychrus except perhaps P. peruvianus in usually having a median element in the internasal scale row. Autapomorphies include the following: unicuspid tooth series extends as far back as posterior end of palatine process of maxilla, tooth tips generally moderately recurved (also in P. femoralis), anteroposteriorly foreshortened nasal bone, pterygoid process of ectopterygoid very shallowly oriented, circular lacrimal facet on prefrontal, and quadratojugal process on jugal. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||
Age range: Chadronian or 37.20000 to 33.90000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chadronian | USA (North Dakota) | Polychrus charisticus, Xenosauridae MPH-1 (16991) |