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Pal Z new papers
One paper each in the Palaeontologische Zeitschrift Band 77 Heft 1
(April 2003) for those interested in pterosaurs or sauropods.
S. Ch. Bennett (2003): New crested specimens of the Late Cretaceous
pterosaur Nyctosaurus. - Palaeontologische Zeitschrift, 77 (1): 61-75, 6
figs., 1 tab.; Stuttgart.
Nyctosaurus turns out to have an extraordinary large cranial crest
nearly three times the length of the skull and branching into an upward
extending and a shorter backward extending ramus. Evidence is based on 2
specimens in a private collection. No species name is applied, although
it is said that the specimens belong to one of the previously named
three species for which a revision is promised.
P. M. Sander & Ch. Tueckmantel (2003): Bone lamina thickness, bone
apposition rates, and age estimates in sauropod humeri and femora. -
Palaeontologische Zeitschrift, 77 (1): 161-172, 4 figs., 6 tabs.;
Midshaft sections of different sauropod humeri and femora from Tendaguru
(Tanzania; Barosaurus, Janenschia, Brachiosaurus) and
Howe-Stephens-Quarry (Wyoming; Apatosaurus, Diplodocidae indet.) were
analyzed for lamina thickness and apposition rate. There are a mean of
4.8 laminae/mm independent of locality, taxon, bone, and even
ontogenetic stage, although there appears to be a slight decrease in
lamina thickness in adulthood. Apposition rates vary widely with age
(e.g. juv. 10 micrometer/day, adult 2 micrometer/day) and among taxa.
The data is used to calculate individual ages of sauropods. Based upon
acquired apposition rates the individual age of sauropods lacking growth
lines is estimated too.
Dr. Markus Moser
Bayerische Staatssammlung fuer Palaeontologie und Geologie
Ludwig-Maximilians-Universitaet Muenchen, Department fuer
Geo- und Umweltwissenschaften, Sektion Palaeontologie