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Value of craniometrical traits in chinchillas [Chinchilla laniger] skulls considering teeth defects

100%

Baranowski P., Wojtas J., Cis J., Musial G., Wroblewska M., Sulik M.

Bulletin of the Veterinary Institute in Puławy

2008

tom 52

nr 2

The study aimed at determining whether teeth defects in chinchillas (Chinchilla laniger), consisting in excessive growth of I, P, and M1-M3 teeth, bring about differences in the value of cranial breadth-length traits in those rodents. The examinations were made on 109 skulls of somatically mature chinchilla females aged 1 to 3 years. The skull's weight and that of mandible was determined, as well as 48 craniometrical traits of the braincase and the splanchno-cranium was measured. For each craniometrical trait, its mean value, standard deviation, and minimum and maximum values were determined, as well as cranial indices and simple correlations between the traits were calculated. Statistical analysis did not show normal distribution of traits. It was showed that the mean skull weight as well as that of the mandible in chinchillas without teeth defects was significantly lower than in animals with such defects. On the other hand, teeth defects brought about differences in the basic values of metrical traits for the lateral part of skull, basal skull, and mandible. No differences were found in the values of the nuchal part traits of the examined chinchilla skulls.

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

80%

Niven L. B., Wojtal P.

Acta Zoologica Cracoviensia

2002

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

1 Acta Zoologica Cracoviensia

1 Bulletin of the Veterinary Institute in Puławy

1 Baranowski P.

1 Cis J.

1 Musial G.

1 Niven L. B.

1 Sulik M.

1 Wojtal P.

1 Wojtas J.

1 Wroblewska M.

1 2008

1 2002

Wyniki wyszukiwania

Value of craniometrical traits in chinchillas [Chinchilla laniger] skulls considering teeth defects

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