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Nanodobenus arandai
Taxonomy
Nanodobenus arandai was named by Velez and Salinas-Márquez (2018). Its type specimen is UABC FCM 0072, a mandible (nearly complete left mandible, including p2–4), and it is a 3D body fossil. Its type locality is Asuncion, which is in a Langhian/Tortonian marine conglomerate in the Torgugas Formation of Mexico. It is the type species of Nanodobenus.
Synonymy list
| Year | Name and author |
|---|---|
| 2018 | Nanodobenus arandai Velez and Salinas-Márquez p. 2 |
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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.
†Nanodobenus arandai Velez and Salinas-Márquez 2018
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Velez and F. M. Salinas-Márquez 2018 | Identified as an odobenid based on the presence of post-canine teeth that are bulbous, longer than high and with smooth enamel. Smallest known odobenid, with a body length estimated at 1.65 m (based on [7]; table 3); further characterized by the following unique combination of mandibular characters: mandibular symphysis with a subtriangular outline (narrower posteroventrally), symphysis short (shared with Proneotherium repenningi, Neotherium mirum, Kamtschatarctos sinelnikovae and Pontolis magnus), genial tuberosity extending well below ventral margin of ramus (shared with Pelagiarctos spp., Archaeodobenus akamatsui, Imagotaria downsi, P. magnus, Dusignathus spp. and Ontocetus emmonsi), and located posterior to p2 (shared with P. magnus, Dusignathus spp., Gomphotaria pugnax and O. emmonsi). Differing further by the following dental characters: lower canine with bilobed root (shared with N. mirum, Pelagiarctos spp. and I. downsi); well-developed enamel on post-canine teeth (as in most early odobenids, and differing from P. magnus, Dusignathus spp., G. pugnax and odobenines); post-canine teeth with small, but distinct paraconid cusp (shared with N. mirum, K. sinelnikovae, I. downsi, Pelagiarctos spp. and A. akamatsui); absence of a talonid basin on the post-canine teeth (shared with Pr. repenningi, A. akamatsui and odobenines), p2 root bilobed, double rooted p3–4 and retention of m2 (differing from the single roots and lack of m2 of Dusignathus spp., G. pugnax and more derived odobenids). |
Measurements
No measurements are available
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| Source: f = family, c = class, uc = unranked clade | |||||
| References: Carreño and Cronin 1993, Hendy et al. 2009, Kohno et al. 1995 | |||||
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Langhian - Tortonian | Mexico (Baja California Sur) | Nanodobenus arandai (type locality: 57778) |