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Re: POSSIBLE FUNCTION OF ORDERLY RINGS OF DINO EGGS? (Was Re: Pubic Pendulum]
David,
There are Prismatoolithid eggs (somewhat similar to those of Troodon)
which are believed to be protoceratopsian. Whether such similarities are
plesiomorphies or convergences is unclear.
The Dendroolithid eggs once thought to belong to segnosaurs may
actually belong to ornithopods, and conversely some of the Spheroolithid
eggs thought to belong to ornithopods may belong to segnosaurs (although
both these egg families are dinosauroid-spherulitic, so this isn't
particularly surprising).
But Gerald Grellet-Tinner has some papers coming out this year that
may very well shake up much of the eggshell classification business once
again. Looking forward to those, as the literature is apparently riddled
with errors and misinterpretations and even the egg experts are struggling
to sort it all out.
-------Ken Kinman
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David Marjanovic wrote:
AFAIK, ironically not a single protoceratopsian egg is known, they are all
oviraptorosaurian, based on egg shell morphology: Birds and oviraptorosaurs
have so-called ornithoid eggshell. *Troodon* has a different (though not
too
dissimilar) type called dinosauroid-prismatic.
There are ornithoid eggs like *Macroelongatoolithus* that are
around
40 cm in length. This should point to enormous oviraptorosaurs. There are
eggs claimed to be segnosaurian; these have a totally different eggshell
type... have to look it up, AFAIK it's called dendrolithic.
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