Re: Re:Re: Baculum and Anal fins


drosen0000@xxxxxxxxx wrote:
Are you sure that there is no "penis bone" associated with
nonmammalian species?

Yes. Among living reptiles the snakes and lizards have paired
hemipenes, hollow, eversible copulatory structures housed in the base
of the tail. Turtles and crocodilians have single, eversible structures
arising from the cloacal wall. Tuataras lack a male copulatory organ,
as do birds. No bones in any of them, although the snake hemipenes
have, in some species, spiny decorations, but these are not baculae.

That difference in bone tissue was recently discovered. However,
the researcher knew before making that claim that the skeleton being
looked at was female. If the skeleton turns out to be male, the theory
may have to be reconsidered. There is a difference in sizes said to
exist between male and female T. rexes. Apparently, some means of
distinguishing T. rex gender has been available for some time, other
than a "difference in bone tissue."
I had read years before that that there is another "penis bone"
structure that supposedly distinguishes between T. rex genders. I read
an article that didn't have a picture of the feature in question. While
looking a the skeleton of a purportedly male T. rex in a museum, I
convinced myself that a large bone located in the exact right place was
the penis bone. It sure looked impressive |:-)

For discussion about the lack of evidence for sexual dimprphism in
Tyrannosaurus check out wikipedia:
http://en.wikipedia.org/wiki/Tyrannosaurus#Sexual_dimorphism
They indicate that there is little evidence of a sex-specific
difference in the bones. There is a list of references that you can
pursue further. Apparently your memory was of the chrevron bones
associated with the first tail vertebra, which are now considered
doubtful as indicators of sex.


.

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