Eurolagus fontannesi Depéret, 1887
Sugerowana cytacja: Kapuścińska, A. 2016. Eurolagus fontannesi Depéret 1887. Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/view/Species/Eurolagus+fontannesi)
Diagnoza Large semihypsodont lagomorph, smaller than Megalagus and larger than Amphilagus antiquus, Desmatolagus, most species of Gobiolagus, Gripholagomys, Mytonolagus, Piezodus, and Titanomys, and all species of Palaeolagus, except the larger P. intermedius. More strongly hypsodont than most of the primitive stem lagomorphs, with a tooth crown height comparable to that of Megalagus and advanced Mytonolagus (M. wyomingensis), slightly lower than that of Amphilagus, and markedly lower than that of the semihypsodont species of Palaeolagus. Curvature of the upper teeth is definitely larger than in Palaeolagus, less than in the rootless Titanomys calmensis, and similar to that in Amphilagus, Desmatolagus, Megalagus, Mytonolagus, Titanomys visenoviensis, and Piezodus branssatensis. A trilobate P2 distinguishes Eurolagus from the basically bilobate tooth of Palaeolagus. P3 is not molarized, unlike that of Palaeolagus; the lingual lobe of P3 is longer than in Amphilagus, Desmatolagus, Gobiolagus, and most of Mytonolagus, and more compressed anterodistally than in those genera and in Megalagus. P4 molarized unlike that of Gobiolagus and Lushilagus. Persistency of the enamel pattern on the upper cheek teeth separates Eurolagus from Lushilagus, Shamolagus, and Gobiolagus, in all of which the hypostriae are weak and the occlusal pattern wears relatively quickly. The hypostria is deeper than in Desmatolagus, and comparable to that of Mytonolagus and Megalagus; it is relatively shallow on P3 and P4 (shallower than in Palaeolagus) and cuts across one−third of the occlusal surface on M1 and M2. Hypostrial lakes are absent in Eurolagus, unlike in Palaeolagus, Megalagus, Mytonolagus, Gripholagomys, and Desmatolagus. The p3 is single−rooted, unlike the double−rooted tooth of Mytonolagus, Megalagus, and Strenulagus. The crown of p3 is bilobate and compact, with a short and relatively large trigonid, and a slightly concave anterolingual side in younger individuals, resembling in outline and proportions the p3 of Amphilagus antiquus, Megalagus, and Gripholagomys at most wear stages. This tooth further differs from that of Desmatolagus, which has a smaller trigonid, Mytonolagus, which has an enlarged trigonid, and Gobiolagus, Lushilagus, and Shamolagus,which have a trilobate p3. The lingual reentrant of p3 is much less persistent than in Titanomys, Palaeolagus, and some species of Mytonolagus. Together with the absence of an isolated anteroconid, this distinguishes Eurolagus from Piezodus. Differs from all genera (apart from Mytonolagus) in havingmore persistent reentrants on the buccal instead of the lingual side of the talonids of the lower cheek teeth. The m2 has fused roots as in Amphilagus and Palaeolagus, unlike the condition in Megalagus and Mytonolagus. The m3 is reduced in comparison to that in Lushilagus, Shamolagus, and Gobiolagus and marked by two conids, unlike the m3 in Amphilagus, Titanomys, and Piezodus (m3 with single conid). Both conids become fused late during ontogeny as in Desmatolagus, but unlike the condition seen in Megalagus and Palaeolagus. Eurolagus further differs from Gobiolagus, Lushilagus, Mytonolagus, and Shamolagus in having no trace of an additional lobe on m3. Porównanie Autekologia Terrestial herbivore. Występowanie geograficzne Western and central Europe. Zasięg czasowy Late Middle to Late Miocene. Materiały muzealne P2 (MF/5065, MF/5066, MF/5067, MF/5068, MF/5069); P3 (MF/5070, MF/5071, MF/5072 juv., MF/5075); P4 (MF/5074, MF/5101/a, MF/5077); M1 (MF/5076, MF/5101/b, MF/5080); M2 (MF/5078, MF/5079, MF/5081, MF/5073 juv.,MF/5088); p3 (MF/5082, MF/5083);m1 orm2 (MF/5084, MF/5085, MF/5086); m3 (MF/5087); trigonids of lower premolars or molars (MF/5089–95, MF/5099); talonids of lower premolars or molars (MF/5096–98); other tooth frag− ments (MF/5101); Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Kraków, Poland. Literatura Depéret, C. 1887. Etudes paléontologiques dans le basin du Rhône. Période miocène. Recherches sur la succession des faunes des vertébrés miocènes de la vallée duRhône. Archives de Muséum d’histoire Naturelle de Lyon 4: 45–313. |
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