Nógrád Megyei Múzeumok Évkönyve XX. (1995)

Tanulmányok - Természettudomány - Hír János: Felső miocén aprógerincesek Egyházasdengelegről

m2 95.137. 1.54 1.47 m3 95.138. 1.30 1.23 тЗ 95.139. 1.44 1.40 тЗ 95.140. 1.40 1.10 Figs. 52-53. Description Ml The pattern of the upper molars hâve a reversed stucture similar to the one described in the case of A viretschaubi ml. Among the available 5 molars 3 have an isolated fold System (no connection between the 3 folds) and 2 have continuous Systems. M3 2 molars have an isolated fold System. In one specimen (95.149), only the posterior fold is isolated and another one displays a continuous system (1 hardly worn). ml The structure of ml is similar to A. viretschaubi but its measurements are smaller (Fig. 44-45.). m2 The pattern of the occlusal surface is similar to the ml. but differs from it in the less elongated shape of the toothcrown. m3 On the best preserved molar, the posterior fold is isolated. Comments Anomalospalax viretschaubi was described from the fauna of Polgárdi by Kordos (1985). In our material, only one molar can be related to this species. The majority of the anomalomyd remains from Egyházasdengeleg are from a smaller sized (smaller than A. tardosi from Tardosbánya: Fig. 54-55.) exectly undeterminable species. On a morphological basis, the older Miocène gênera of Anomalomys. Myospalax and Allospalax can be excluded. Discussion The accurate évaluation of the fauna from Egyházasdengeleg is impeded by the low number of specimen. In spite of this fact, some conclusions can be drawn. Among the well known Central European Late Miocène faunas. Egyházasdengeleg is younger than Eichkogel and Tardosbánya because in these faunas, Progonomys and Spermophilinus bredai and the very low crowned Kowalskia skofleki were found. The relation to the faunas of Polgárdi is not completely understood, but in Egyházasdengeleg all the common and studied rodent famílies are represented by species of earlier evolutionary levels: smaller sized Parapodemus, lower crowned and smaller sized Kowalskia and smaller Anomalospalax. These facts suggest an older âge for Egyházasdengeleg than for Polgárdi. The supposition of désert circumstances in the Late Neogene has a long tradition in the Hungárián geological and geomorphological literature (from Lóczy, 1890). The most récent summary of this problem was given by Schweitzer et Szöőr (1992) with a compétent geochemical argumentation. The cross-bedded sand is regarded to be the corrélative sédiment of this dry period. 182