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Ptychoceratodus roemeri
Taxonomy
Ptychoceratodus roemeri was named by Skrzycki (2015). Its type specimen is ZPAL AbIII/2393, a tooth (lower tooth plate with attached prearticular fragment), and it is a 3D body fossil. Its type locality is Krasiejów locality (lower), which is in a Carnian/Norian fluvial siltstone/sandstone in the Grabowa Formation of Poland.
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Ptychoceratodus roemeri Skrzycki pp. 3-4 figs. (Figs. 2–5) |
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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.
†Ptychoceratodus roemeri Skrzycki 2015
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Skrzycki 2015 | Tooth plates with convex occlusal surface; occlusal pits present on the occlusal surface and in inter-ridge furrows; upper tooth plates having five ridges, lower tooth plates having four ridges; upper and lower symphyses long; upper tooth plates contiguous and having the first ridge posteriorly curved, lower tooth plates having first ridge straight and more robust than other ridges; in both upper and lower tooth plates, last ridge is the longest one; fourth inter-ridge furrow of upper tooth plates short and reaching about one-third of the length of the fifth ridge; the enamel to bone junction on the labial side of the tooth plate is straight; pterygopalatine sulcus shallow, prearticular sulcus double; short ascending process of pterygopalatine, oval in section and placed above the second ridge of upper tooth plate; small incision present between symphyseal and posterior processes of pterygopalatine bone; prearticular bone arc-shaped with short posterior process; inner (a) angle (of upper and lower tooth plates) broadens and rest of angles between ridges (of lower tooth plates) narrow during ontogeny; the first ridge grows faster than the fourth one in lower tooth plates. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009 | |||||
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Carnian - Norian | Poland (Opole) | Ptychoceratodus roemeri (type locality: 61448) |