[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: more about "feather" find

Here's another blog post on it, with links to more.

It says that a fossil of a small dinosaur of the saurichian line was covered
with long very primitive feathers.

No, it's an ornithischian, and that's part of why it's such a surprise!!!

Have any of you looked closely at the fur of a cat?  Some modern mammals
could be said to have very primitive feathers.

Less so than *Tianyulong*. *Tianyulong* has pretty stiff bristles that were half a millimeter thick -- that's more like the keel of a feather than like a hair.

"They were very gently curved but otherwise rigid - no bends or waves were found."

When did synapsids develop their fibrous body covering?

The docodont *Castorocauda*, closely related to Mammalia-in-the-strictest-sense, had fur, but beyond that we don't know. The dinocephalian *Estemmenosuchus*, a Middle Permian animal, appears to have had naked skin. Somewhere between these two, then... that's a lot of space...

Maybe this is parallel evolution.

Of course. Ornithodirans and synapsids aren't sister-groups. Do the names Sauropsida and Theropsida (mind the o!) ring a bell for you?

Clearly it was an advantage to develop hom[e]othermy.

In some environments, yes.