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Socognathus unicuspis
Taxonomy
Socognathus unicuspis was named by Gao and Fox (1991). Its type specimen is UALVP 29739, a mandible (an incomplete left dentary bearing 11 well-preserved teeth and bases of six others), and it is a 3D body fossil. Its type locality is Railway Grade, which is in a Judithian terrestrial horizon in the Oldman Formation of Canada.
Synonymy list
| Year | Name and author |
|---|---|
| 1991 | Socognathus unicuspis Gao and Fox |
| 1996 | Socognathus unicuspis Gao and Fox p. 25 |
| 2001 | Socognathus unicuspis Peng et al. p. 27 |
| 2010 | Socognathus unicuspis Nydam et al. p. 1093 |
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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.
†Socognathus unicuspis Gao and Fox 1991
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| K. -Q. Gao and R. C. Fox 1991 | Relatively large teiid differing from other teiids in having the unique combination of the following characters: dentary long and robust; mandibular symphysis strongly enhanced by ventral bony buttress; teeth unicuspid, slightly compressed anteroposteriorly, and mostly large, but variable in spacing and recurvature of crowns; tooth attachment subpleurodont, with lateral parapet low, about one-third of crown height; crowns with moderately strong anterior ridge and weaker posterior ridge curving ventrolingually from apical cusp. | |
| R. L. Nydam et al. 2010 | Late Cretaceous borioteiioid differing from other chamopsiids in marginal teeth not crowded along tooth row, but variable in spacing and orientation; teeth tall, with straight mesial and distal sides, somewhat compressed mesiodistally and recurved; tooth crowns mediolaterally concavo-convex, unicuspid with cusp pointed, inclined somewhat posterolingually. Differs further from Gerontoseps irvingensis in having moderately strong mesial carina and weaker distal carina (i.e., non-symmetrical) curving lingually from apical cusp; tooth attachment subpleurodont, with lateral parapet low, about one-third tooth height. Differs further from Stypodontosaurus melletes in having tooth crowns more acutely pointed, not spatulate. Differs further from Sphenosiagon simplex in teeth set at an oblique angle to the long axis of the jaw. Differs further from Chamops and Leptochamops in having interior alveolar foramen of maxilla open more anteriorly; articulation surface for palatine significantly deeper and anteriorly more extensive. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Carroll 1988, Hendy et al. 2009, Kiessling 2004 | |||||
Age range: Judithian or 83.60000 to 72.20000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Judithian | Canada (Alberta) | Socognathus unicuspis (14463 type locality: 116537) | |
| Late/Upper Campanian | Canada (Alberta) | Socognathus unicuspis (45671 89604) | |
| Middle Campanian | Canada (Alberta) | Socognathus unicuspis (45565 45670) | |
| Middle Campanian - Late/Upper Campanian | Canada (Alberta) | Socognathus unicuspis (45821) |