| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Metaceratodus baibianorum
Taxonomy
Metaceratodus baibanorum was named by Panzeri et al. (2020). Its type specimen is MPEF-PV 11422, a partial skull, and it is a 3D body fossil. Its type locality is Abra de la Tortuga, which is in a Maastrichtian terrestrial mudstone in the La Colonia Formation of Argentina.
It was corrected as Metaceratodus baibianorum by Panzeri et al. (2020) and Panzeri (2023).
It was corrected as Metaceratodus baibianorum by Panzeri et al. (2020) and Panzeri (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Metaceratodus baibianorum Panzeri et al. p. 5 fig. 4–6 |
| 2023 | Metaceratodus baibianorum Panzeri p. 107 |
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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.
†Metaceratodus baibianorum Panzeri et al. 2020
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| K. M. Panzeri et al. 2020 | Metaceratodus species characterized by the following combination of characters: ridges that originate from the posteromedial inner angle; inner angle located at the level of the second cleft in the pterygopalatine tooth plates, and at the level of the second ridge in the prearticular tooth plates; clefts decrease in depth anterocaudally; punctuations distributed without a clear pattern; wear pattern in life in the form of superficial and defined circles over the furrows and on the mediolingual edge where the circles converge with each other; the medial edge longer than the lingual edge and equally curved; the lingual edge of the pterygopalatine tooth plates forming a straight angle with the sagittal plane; the first ridge of the pterygopalatine tooth plates are more slender that of the prearticular ones, with equal thickness toward the labial edge; thefirst ridge of the prearticular tooth plates are robust, with a wide base, and becoming sinuous and thinner toward the labial edge; the fourth and fifth denticulations in the pterygopalatine tooth plates are involved in the formation of the step; the fourth denticulation in the prearticular tooth plates form the spur; five denticulations in the pterygopalatine tooth plates; and four denticulations in the prearticular tooth plates. | |
| K. M. Panzeri 2023 | Placas dentarias que alcanzan tamaños medianos a grandes (5,09 cm de borde medial y 4,07 cm de borde lingual), con áreas de meseta desarrolladas. Placas dentarias pterigopalatinas con cinco denticulaciones y placas prearticulares con cuatro denticulaciones. Denticulaciones y crestas redondeadas, con hendiduras que disminuyen en profundidad hacia la parte posterior. Patrones de desgaste por accionar de las quijadas en forma de círculos superficiales y definidos sobre los surcos y en el borde mediolingual donde los círculos convergen entre sí. El borde medial más largo que el borde lingual e igualmente curvados. El borde lingual de las placas dentarias pterigopalatinas forman un ángulo recto con el plano sagital. Bisectriz del ángulo interno ubicado al nivel del segundo hendidura en placas dentarias pterigopalatinas, y al nivel de la segunda denticulación en placas dentarias prearticulares. Primera denticulación de las placas dentarias pterigopalatinas se dirige anterolabialmente, no posee faceta de desgaste anterior, es de base ancha, y con igual grosor hacia el extremo el cual se dirige posteriormente. Primera denticulación de las placas dentarias prearticulares es robusta, con una base ancha y se vuelve sinuosa y más delgada hacia el borde labial, su extremo se dirige medialmente. Cuarta y quinta denticulaciones en placas pterigopalatinas están involucradas en la formación del escalón; la cuarta denticulación en las placas prearticulares forma el espolón. Hueso pterigopalatino con proceso ascendente a nivel de la segunda denticulación. Sínfisis del pterigopalatino más larga anteroposteriormente que ancha dorsoventralmente y levemente más ancha anteriormente. El extremo posterior de la sínfisis coincide con el ángulo interno de la placa dentaria. Capa de dentina circundenteonal simple y delgada; dentina interdenteonal con un patrón en cruz ordenado. Placas dentarias con crecimineto alométrico. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||
Age range: Maastrichtian or 72.10000 to 66.00000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Maastrichtian | Argentina (Chubut) | Metaceratodus baibanorum (99438 208435 type locality: 216698) |