Tiuclaenus robustus Muizon & Cifelli 2000

Autor: Muizon, Christian de, Billet, Guillaume, Ladev��ze, Sandrine
Rok vydání: 2019
Předmět:
DOI: 10.5281/zenodo.3704864
Popis: Tiuclaenus robustus Muizon & Cifelli, 2000 DIAGNOSIS. ��� See Muizon & Cifelli (2000). DESCRIPTION A right mandible fragment bearing m2-3 (MHNC 13875) has been referred to Tiuclaenus robustus (Fig. 10B, C) essentially because, although structurally similar to the other species of Tiuclaenus (T. minutus and T. cotasi), it differs from them in its size, distinctly larger, and in its greater massiveness. Furthermore, as is observed on the holotype (a mandible fragment with m2-m3, MHNC 1233), m3 of MHNC 13875 is proportionally shorter than in T. minutus and T. cotasi being barely longer than m2. An interesting feature of this specimen is the morphology of the roots of m2 and m3, which are long extending ventrally on more than 2.5 the height of the crown (Fig. 10C). Furthermore, the apices of the roots are markedly splayed with their posterior edges extending posteriorly, providing the extremity of the root a characteristic hammer-shape. Although the ventral edge of the dentary is partly broken, this morphology gives the impression that the root had to develop posteriorly because it was abutting the ventral edge of the mandibular canal.
Published as part of Muizon, Christian de, Billet, Guillaume & Ladev��ze, Sandrine, 2019, New remains of kollpaniine " condylarths " (Panameriungulata) from the early Palaeocene of Bolivia shed light on hypocone origins and molar proportions among ungulate-like placentals, pp. 841-874 in Geodiversitas 41 (25) on page 856, DOI: 10.5252/geodiversitas2019v41a25, http://zenodo.org/record/3699898
{"references":["MUIZON C. DE & CIFELLI R. L. 2000. - The \" condylarths \" (archaic Ungulata, Mammalia) from the early Palaeocene of Tiupampa (Bolivia): implications on the origin of the South American ungulates. Geodiversitas 22 (1): 47 - 150."]}
Databáze: OpenAIRE
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