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A new generic name for the multituberculate mammal Djadochtatherium catopsaloides

100%

Kielan-Jaworowska Z.

Acta Palaeontologica Polonica

1994

tom 39

nr 1

Counting premolars in early eutherian mammals

84%

Cifelli R. L.

Acta Palaeontologica Polonica

2000

tom 45

nr 2

The primitive number of premolars for most eutherian groups is four. A growing number of Cretaceous taxa, however, had five. Regardless of the hypothesis used to explain the discrepancy, or what the primitive condition was, it is generally agreed that the middle (third) tooth of five-premolared taxa is the one not represented in mammals that have only four premolars. Hence the current practice of labeling the teeth as the first through fifth and the first through fourth, depending on how many teeth are observed in the jaw, results in incorrect implied homologies for the last two premolars of the series. Given the long-standing tradition of referring to the premolars as the first through fourth, for most eutherian groups, together with the uncertainties involved in interpreting the difference, the most practical solution is to refer to the disputed tooth by a neutral term, 'Px', as advocated several decades ago.

Identical cheek tooth anomalies in two Polish brown hare populations

84%

Suchentrunk F., Markowski J.

Acta Theriologica

1992

tom 37

nr 4

Mandibles of 258 brown hares Lepus europaeus Pallas, 1778 from Poland were controlled for abnormal expression of the premolars. In four individuals a reciprocal transposition of the right and left third lower premolars was found. In addition, all the affected premolars were rotated. The rotation showed bilateral symmetry in each of the four specimens. A genetical basis is suggested for this type of tooth anomaly.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

1 Acta Theriologica

1 Cifelli R. L.

1 Kielan-Jaworowska Z.

1 Markowski J.

1 Suchentrunk F.

1 2000

1 1994

1 1992

Wyniki wyszukiwania

A new generic name for the multituberculate mammal Djadochtatherium catopsaloides

Counting premolars in early eutherian mammals

Identical cheek tooth anomalies in two Polish brown hare populations