Aspects of hadrosaurian cranial anatomy |
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Authors: | TERESA MARYA KA,HALSZKA OSMÓ LSKA |
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Affiliation: | Museum of the Earth, Polish Academy of Sciences, Al. No Skarpie 20/26, PL-00–488 Warszawa;Institute of Palaeobiology. Polish Academy of Sciences, Al. Zwirki i Wigury 93, PL-02–089 Warszawa |
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Abstract: | Supraorbital bones in Saurolophus angustirostris are described, and their presence in all hadrosaurs is suggested. Frontal-nasal and premaxillar-nasal fontanellae are distinguished in hadrosaurs; their presence is explained as connected with growth and considered to he responsible for the variability of crest structures. New data indicating the presence of a cartilaginous diverticulum nasi within the circumnarial depression in Saurobphus ongustirostris are presented. A physiological (respiratory and/or thermoregulatory) function of the nasal diverticulum is proposed. |
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