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Microsphenodon bonapartei
Taxonomy
Microsphenodon bonapartei was named by Chambi-Trowell et al. (2021). Its type specimen is UFRGS-PV-0972-T, a skull, and it is a 3D body fossil. Its type locality is Faxinal do Soturno, Linha São Luiz, which is in a Norian fluvial siltstone/sandstone in the Caturrita Formation of Brazil. It is the type species of Microsphenodon.
Synonymy list
| Year | Name and author |
|---|---|
| 2021 | Microsphenodon bonapartei Chambi-Trowell et al. p. 17–18 figs. 4, 6, 7–14 |
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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.
†Microsphenodon bonapartei Chambi-Trowell et al. 2021
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. A. V. Chambi-Trowell et al. 2021 | A small sphenodontian rhynchocephalian with a skull length of 19–22 mm, which has the following unique combination of features:
1. A single caniniform tooth present on both maxilla and dentary. 2. The maxillary and dentary dentition is acrodont and the largest teeth take the form of two enlarged mesiodistally elongated additional teeth at the posterior of the dentary and maxilla, posterior to a row of smaller non-hatchling teeth that alternate in size. 3. A broad flat parietal table. 4. Three to four small conical post-marginal teeth positioned behind the additional teeth of the maxilla. 5. A palatine with a single medially positioned tooth, in addition to a secondary row or ridge of two teeth that are positioned at 45° to the long axes of the main lateral tooth row. 6. Fused prearticular, articular and surangular bones. 7. Paired frontals and parietals. 8. Exoccipitals fused to basioccipital. 9. Two rows of vomerine teeth, three rows of pterygoidal teeth and two rows of palatine teeth. |
Measurements
No measurements are available
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| Source: subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||