Wyniki wyszukiwania

1

Mammoth population from Cracow Spadzista Street [B] site

100%

Lipecki G., Wojtal P.

Acta Zoologica Cracoviensia

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1996

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tom 39

|

nr 1

2

Mammalian evolution in response to the Pleistocene-Holocene transition and break-up of the mammoth steppe: two case studies

84%

Guthrie R. D.

Acta Zoologica Cracoviensia

|

1995

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tom 38

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nr 1

3

The new Upper Palaeolithic mammoth site at Halich [Ukraine]

84%

Wojtal P., Cyrek K., Sytnik A.

Acta Zoologica Cracoviensia

|

2001

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tom 44

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nr 2

4

The number of mammoths Mammuthus primigenius [ Blumenbach, 1799 ] at the Cracow Spadzista Street B site, estimated on the basis of their postcranial skeletal bones

67%

Wojtal P.

Acta Zoologica Cracoviensia

|

1994

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tom 37

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nr 1

5

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Structure and evolution of mammoth molar enamel

67%

Ferretti M. P.

Acta Palaeontologica Polonica

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2003

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tom 48

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nr 3

This work investigates the structure of Eurasian Plio–Pleistocene Mammuthus enamel, with attention to diagenesis and individual variability. A focal point of this study was to determine whether morphological trends in Mammuthus molars were accompanied by correlated enamel microstructure changes. In the examined four taxa the enamel of the cheek teeth consists of three layers delimited by two major discontinuities in enamel prism direction. Noticeably, the enamel capping the occlusal end of the unworn molar plates retains a less derived two−layered structure, similar to that found in the basal proboscidean Moeritherium. In Mammuthus meridionalis the third deciduous premolar is differentiated from all other teeth in having more strongly decussating Hunter−Schreger bands in the middle layer, as a possible reinforcement of the very thin enamel. Evidence from this analysis shows that, in the transition from late Middle Pliocene M. rumanus to Late Pleistocene M. primigenius, the middle enamel layer, which is made up of prisms at an angle to the occlusal surface, providing greater resistance against wear, increased its relative thickness. This is consistent with the hypothesis that Mammuthus adapted to a more abrasive diet. Comparison with other proboscidean taxa indicates that the schmelzmuster (enamel pattern) found in Mammuthus is a synapomorphy of the Elephantoidea.

6

Cement furrows in the dentition of Mammuthus primigenius and the question of their etiology

67%

Niven L. B., Wojtal P.

Acta Zoologica Cracoviensia

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2002

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tom 45

|

nr 2

Linear furrows have been documented in the crown cement of Mammuthus primigenius molars from the late Pleistocene archaeological sites of Kraków Spadzista Street (B), Poland and Vogelherd, Germany. The high frequency of cement defects on these assemblages, 50% and 74% of the molars respectively, and on other fossil proboscidean teeth from Eurasia warrants investigation into their etiology. One possible cause of the furrows is a developmental defect such as hypoplasia, due to periodic physiological stress; such a causal factor could have broad implications for the life history of woolly mammoths. Other potential origins of the furrows include cement decay from infection or impaction of material in the gums and resorption of tooth cement. Apart from cause, the morphology of the cement furrows reflects regular rhythms of seasonal or annual formation.

Ograniczanie wyników

5 Acta Zoologica Cracoviensia

1 Acta Palaeontologica Polonica

4 Wojtal P.

1 Cyrek K.

1 Ferretti M. P.

1 Guthrie R. D.

1 Lipecki G.

1 Niven L. B.

1 Sytnik A.

1 2003

1 2002

1 2001

1 1996

1 1995

1 1994

Mammoth population from Cracow Spadzista Street [B] site

Mammalian evolution in response to the Pleistocene-Holocene transition and break-up of the mammoth steppe: two case studies

The new Upper Palaeolithic mammoth site at Halich [Ukraine]

The number of mammoths Mammuthus primigenius [ Blumenbach, 1799 ] at the Cracow Spadzista Street B site, estimated on the basis of their postcranial skeletal bones

Structure and evolution of mammoth molar enamel

Cement furrows in the dentition of Mammuthus primigenius and the question of their etiology