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Trichechus hesperamazonicus
Taxonomy
Trichechus hesperamazonicus was named by Perini et al. (2020). Its type specimen is UNIR-PLV-M 003, a mandible (partial right dentary with four molars, part of the ascending ramus, and the symphyseal region), and it is a 3D body fossil. Its type locality is Araras/Periquitos, which is in a Pleistocene/Holocene fluvial sandstone in the Rio Madeira Formation of Brazil.
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Trichechus hesperamazonicus Perini et al. figs. Fig. 3 |
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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.
†Trichechus hesperamazonicus Perini et al. 2020
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. A. Perini et al. 2020 | Trichechus hesperamazonicus presents continuous horizontal tooth replacement, with identical serial molars, closed alveoli anteriorly, and an active dental capsule posteriorly. It differs from Ribodon by the much smaller molars (>20 mm in length) and more coalesced and compressed lophs and lophids. Trichechus hesperamazonicus is similar to T. inunguis and T. senegalensis and differs from T. manatus by the lack of deep mandibular symphysis with a ventral keel. Like most Trichechus, and unlike T. senegalensis, the mandibular foramen is undivided. It differs from T. inunguis and is more like other Trichechus in having relatively large molars, with about five functional molars at the same time, and by having fewer mental foramina (two in available specimens). It differs from all other Trichechus species by possessing a wide space between the lower tooth row and ascending ramus of dentary; anterior border of ascending ramus hiding the posterior end of tooth row in lateral view; and an elevated bone ridge, anterior to the upper molar series, running through the medial side of the tooth-bearing part of the maxilla. |