Détail de la notice
Titre du Document
Le genre Plagiolophus (palaeotheriidae, perissodactyla, mammalia) : Revision systematique, morphologie et histologie dentaires, anatomie cranienne, essai d'interpretation fonctionnelle
The Plagiolophus genus (palaeotheriidae, perissodactyla, mammalia) : systematic revision, morphology and dental histology, skull anatomy, functional interpretation attempt
Auteur(s)
REMY Jean A.
Résumé
The genus Plagiolophus is documented, almost solely in Western Europe, from the middle Eocene up to the mid Oligocene (MP 12 to MP 25), i.e. more than for 15 MY. Seventeen species are now recorded whose two of them are new, P. ringeadei nov. sp. and P. mamertensis nov. sp. Some anatomical variations and the deflection of certain evolutionary trends justify the distinction of three subgenera, Paloplotherium, Fraasiolophus nov. and Plagiolophus s.s. The genus displays a wide range in size and weight (between 10 and 150 kg). The detailed description of the skull of several species is here given for the first time. Despite important evolutionary drifts during this long time span, the dentition shows a great structural homogeneity, which renders difficult the determination of fragmentary specimens or isolated teeth. It is characterized by a great heterodonty; premolars are little molarized and present a certain regression through time with paradoxically some progress in the molarization. The hypsodonty increases: the first Plagiolophus are hardly less brachyodont than Propalaeotherium, and the last ones are nearly as hypsodont as Merychippus from the early Miocene. The upper molars change from a wide crown pattern, with an open occlusal surface, lightly oblique transverse lophs and rounded internal cusps, to a narrower pattern, with a frontally constricted occlusal surface and internal lophs aligned parallel to the ectoloph. The M3/3 become always longer. The dental enamel display
Editeur
Université de Montpellier II, Laboratoire de paléontologie
Identifiant
ISSN : 0031-0247 CODEN : PLVTAW
Source
Palaeovertebrata A. 2004, vol. 33, n° 1-4, pp. 17-281 [265 pages] [bibl. : 8 p.1/4]
Langue
Français
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