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Praesynaptomys
Taxonomy
Praesynaptomys was named by Kowalski (1977).
It was assigned to Arvicolidae by Kowalski (1977); and to Cricetidae by McKenna and Bell (1997).
It was assigned to Arvicolidae by Kowalski (1977); and to Cricetidae by McKenna and Bell (1997).
Synonymy list
| Year | Name and author |
|---|---|
| 1977 | Praesynaptomys Kowalski |
| 1997 | Praesynaptomys McKenna and Bell |
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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.
G. †Praesynaptomys Kowalski 1977
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| K. Kowalski 1977 | The incisor, situated over its whole length on the internal side of the mandible, reaches half-way along M3. The molars are rootless. Cement is present in the re-entrant angles. The M1 consists of a posterior loop, three triangles and an anterior loop. On the internal side of the anterior loop there may be a well-developed re-entrant, sometimes filled with cement. In the other specimens this re-entrant is shallow, devoid of cement or hardly marked. On the external side of the anterior loop there is no re-entrant or only a slight depression. All the triangles are isolated and not confluent with the posterior and anterior loops. The tooth is slightly assymetrical; the middle (external) triangle is smaller than the internal triangles. The enemal layer is of more or less the same thickness on the anterior and posterior walls of the triangles, being thinner at the bootom of the re-entrants. There is no enamel on the external surface of the anterior loop and on the external wall of the middle triangle and posterior loop. On the internal side the dentine tracks are usually visible at the tops of the triangles and at the projecting end of the anterior loop. The M2 is composed of an oval posterior loop, two closed triangles and an anterior loop which is broadly confluent with the anterior internal triangle. Also the dentine tracks are distinct on the external side of this tooth. The M3 has an oval anterior loop, two trinagles and a posterior loop. The M^1 has its occlusal surface composed of five isolated dentine fields and the M^2 of four. The M^3 consists of an anterior loop, three triangles and a posterior loop, which lacks enamel over its external side. The antero-external triangle is closed or only slightly confluent with the external triangle, whereas the posterior triangle always fuses more or less extensively with the reduced internal triangle. |