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Author Topic:   On Transitional Species (SUMMATION MESSAGES ONLY)
NosyNed
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Posts: 8996
From: Canada
Joined: 04-04-2003


Message 19 of 314 (505123)
04-07-2009 9:10 PM
Reply to: Message 18 by Richard Townsend
04-07-2009 7:51 PM


groups
I've often heard people say that all species are 'transitional' - but is that really the case? Transitional carries the overtone of 'between two distinct groups'. Not every species can carry the mixed set of characters that this implies - or am I wrong about this?
In fact, I would expect (based on ignorance!) that only a very small subset of species would meet this definition.
You are thinking of a "group" as being something large and far apart like reptiles and mammals. That maybe true but a group can be a genus or even species where the transitional and both of the other parts of the transition maybe darned hard to tell apart.

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NosyNed
Member
Posts: 8996
From: Canada
Joined: 04-04-2003


Message 51 of 314 (506153)
04-23-2009 10:00 AM


Early steps to a seal
The creature was a very early step toward seals etc. and lived about 23 Mya.

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NosyNed
Member
Posts: 8996
From: Canada
Joined: 04-04-2003


Message 117 of 314 (509291)
05-20-2009 8:37 AM
Reply to: Message 116 by RAZD
05-20-2009 7:40 AM


types of preservation
[qs]They have fur, so the degree of preservation is high, that's why I'm positing possible soft tissues available for further analysis.['qs]
I don't think that his follows. The preservation of the shape of the fur and such is a different kind of preservation than that of proteins inside a bone. Very fine grained sediment can preserve evidence of fur but it does not necessarily do anything to support chemical preservation.

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