Oldřich Fejfar

Allosorex stenodus Fejfar, 1966 (Eulipotyphla, Soricidae): re-description of type material and re-interpretation of its fossil record

Abstract

The original fossil record of Allosorex stenodus Fejfar, 1966 from Ivanovce (late Ruscinian, MN 15b) is redescribed and supplemented by the description of so far unpublished fossil remains, including upper dentition (P4 and M3) and a humerus fragment as well as the enamel microstructure analysis of m2. Based on the critical evaluation of other fossil remains from sites in Romania, Hungary, and France, the Ivanovce fossils are so far the only unquestionable recorded finds of A. stenodus in Europe, which can be considered as a local early Pliocene (MN 15) endemic species. Its occurrence is connected with the forested karst area along a broad valley of “pre-Váh” River, ecologically and climatically resembling the environment of modern karst areas in south-eastern Asia. Based on enamel microstructure analysis and unique mandible and dentition morphological characters, a separate taxonomical status of the species is also discussed.

Key words

Allosorex stenodus, Pliocene, late Ruscinian (MN 15b), Ivanovce, Slovakia

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A new Thaumastocyoninae (Amphicyonidae, Carnivora) from the early Miocene of Tuchořice, the Czech Republic

Abstract

New Amphicyonidae fossil remains from the early Miocene site of Tuchořice (the Czech Republic) confirm the presence of a new Thaumastocyoninae taxon: Peignecyon felinoides n. gen. et n. sp. It is characterized by a peculiar combination of plesiomorphic and derived morphological traits. The new genus can be defined by a long and sharp mandible diastema, loss of mesial premolars (p2–p3), p4 with an inclined distally high main cuspid, moderate sectorial carnassial teeth, m1 with relict metaconid, and talonid and trigonid of similar width, and reduced M2 and m2. In the phylogenetic analysis the Thaumastocyoninae form a monophyletic group characterized by the start of the m2/M2 reduction, still moderate in Crassidia intermedia (VON MEYER, 1849), but remarkable in the other species of the clade. Peignecyon felinoides already shows the advanced features defining the Thaumastocyoninae, and constitutes the sister group of the most specialized genera Tomocyon VIRET, 1929b and Thaumastocyon STEHLIN et HELBING, 1925. Consequently, it can be considered an excellent link between this group and the more primitive members of the tribe Ysengrini (Ysengrinia GINSBURG, 1966 and Crassidia HEIZMANN et KORDIKOVA, 2000). Peignecyon felinoides shows that the trend towards hypercarnivory had already emerged in the European early Miocene fauna, thus helping to understand the complex evolution of the Amphicyonidae during the Miocene.

Key words

Thaumastocyoninae, Amphicyonidae, systematics, Miocene, Europe

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