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Fwd: Re: Queries
Tom Holtz wrote:
Many dinosaurs had hollow bones, theropods in particular. Some
and sauropods have extensive systems of pleurocoels in the vertebrae
Brooks Britt about this - he ought to know something on the subject...).
Theropod longbones are all hollow.
>3) Have carpo-metacarus or tars-metatarsus (fused hand/wrist,
>been recorded from dinos?
The carpals of several coelurosaur groups show a trend towards fusion,
forming the semilunate carpal block (which is in origin formed of at
two carpals). In Avimimus, a true carpometacarpus is formed.
Ceratosaurians, Avimimus, and Elmisauridae all show true tarsometatarsi.
Archaeopteryx itself only shows the beginning of this structure.
While researching this question today, I came up with similar lists of
dinos having carpometacarpi and tarsometatarsi. And many theropods
showed up as having hollow long bones, esp. Ceratosauridea
(Ceratosaurus, Dilaphosaurus, Coelosaurus, etc.) as well as some
Coelurasaurs. But your statement that all theropod long bones are
hollow was a surprise. We have a T-rex femur that we are currently
repairing that seems to be quite solid, as shown in the cross sections
of several clean and not-so-clean breaks. I don't think that it is a
hollow bone filled with matrix as our Coelophysis long bones are. Are
all of the Carnosauria included in the hollow bone catagory?
Puzzled in Denver,
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