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- Path: sparky!uunet!tdat!tools3!swf
- From: swf@tools3teradata.com (Stan Friesen)
- Newsgroups: talk.origins
- Subject: Re: Returned mail: Host unknown (fwd)
- Message-ID: <1668@tdat.teradata.COM>
- Date: 24 Dec 92 00:24:46 GMT
- References: <9212172145.AA10073@neptune.gsfc.nasa.gov>
- Sender: news@tdat.teradata.COM
- Distribution: world
- Organization: NCR Teradata Database Business Unit
- Lines: 36
-
- In article <9212172145.AA10073@neptune.gsfc.nasa.gov>, jgacker@neptune.gsfc.nasa.gov (James G. Acker) writes:
- |> :
- |> : Is this the supposed Triassic bird?
- [in reference to Chaterjee's Protoavis].
- |> : If so, it is *extremely* questionable.
- |>
- |> No. It's _Sinornis_, younger than Archaeopteryx. Apparently
- |> more like a bird than Archy. Found in China. (February _Science_).
- |> Archy is 150 m.y. old, Sinornis is 135 m.y. old.
-
- Ah, so, a *slightly* earlier Jurassic bird from China [I do not remember, is this
- still Late Jurassic, or is it Middle Jurassic?].
- This is a different kettle of fish entirely.
- I had not heard of this beastie, so I do not know how good the evidence is.
- |>
- |> "they [the conodont animal] evolved bony teeth while remaining
- |> otherwise squishy. Only later did they adapt bone for other purposes,
- |> such as armor or a skeleton. It's a revolutionary idea, and one that
- |> moves the conodont animals, once an obscure enigma, into the spotlight
- |> of evolution. "They were probably a trivial part of the ecological
- |> system," says Sansom, "but they were part of the lineage that gave
- |> rise to us."
- |>
- |> So, in between the mud and the mammal, there was a squishy
- |> worm. How fun!
-
- But not really that surprising, many people (myself included) have long felt that
- Amphioxis (the Cephalochordate) is a reasonably good model for the ancestors of
- the vertebrates, and it is essentially a small interstitial worm.
-
- I *really* have to remember to get this issue of Discover!
-
- --
- sarima@teradata.com (formerly tdatirv!sarima)
- or
- Stanley.Friesen@ElSegundoCA.ncr.com
-