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Oohkotokia horneri
Taxonomy
Oohkotokia horneri was named by Penkalski (2014). Its type specimen is MOR 433, a partial skeleton (a skull and fragmentary skeleton), and it is a 3D body fossil. Its type locality is MOR TM-034, northwest of Cut Bank, which is in a Campanian terrestrial siltstone in the Two Medicine Formation of Montana. It is the type species of Oohkotokia.
It was synonymized subjectively with Scolosaurus cutleri by Arbour and Currie (2016).
It was synonymized subjectively with Scolosaurus cutleri by Arbour and Currie (2016).
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.
†Oohkotokia horneri Penkalski 2014
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Penkalski 2014 | An ankylosaurine diagnosed by the following unique combination of characters: median plate on nasal area of skull roof small (<50 mm), not distinguished from surrounding osteoderms; prominent, horn-like, trihedral squamosal bosses; keel on squamosal boss flat rostrally, grading into a blunt keel dorsally; apex rounded and unkeeled, situated caudally; caudal surface of squamosal boss flat to gently rounded and unkeeled; broad, smooth quadratojugal bosses with strong caudal curvature; nuchal crest not visible in lateral view; occipital condyle small (≤16% basal skull length); orbit large; osteoderms basally excavated with a smooth, weakly ornamented external surface texture; steeply-pitched, triangular caudal osteoderms. The small nasal plate, caudally curved quadratojugal bosses, and horn-like squamosal bosses distinguish O. horneri from Euoplocephalus tutus. Nuchal crest morphology, supraorbital boss shape, and vertebral morphology separate O. horneri from Dyoplosaurus acutosquameus, and osteoderm shape and texture distinguish O. horneri from D. acutosquameus and Scolosaurus cutleri. The horn-like squamosal bosses distinguish O. horneri from A. lambei. | |
| P. Penkalski 2018 | Differs from S. cutleri in having six well fused osteoderms on h.r.1, in stronger constriction of the sacrodorsals, in a more convex proximal border of ischium, in having some oval, low-keeled osteoderms and steeply pitched, triangular ?caudal osteoderms, and in being a smaller animal. Differs from euoplocephalins in having more recurved squamosal horns with an unkeeled, oval tip. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Marsh 1875 | |||||
Age range: Late/Upper Campanian or 83.50000 to 70.60000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | USA (Montana) | Dyoplosaurus acutosquameus (45681) Euoplocephalus sp. (62541) Oohkotokia horneri (type locality: 138980) Scolosaurus cutleri (232277) |