troodontids and tympanic recesses

[SeanSt8579@aol.com]

So I was at work the other day looking at Chiappe's (in Witmer & Chiappe 
2002) character matrix on page 466, and noticed that he had troodontids down as 
having a tympanic recess that invades the columellar. So far as I was aware, 
this was still a good avian synapomorphy. 

Wanting to check it out, I noticed that the scoring was composite. So I dont 
have to wade through all those papers, does anyone know offhand which species 
he's talking about, and the relevant cite?

-Sean