+ An object of class \code{"yule"} (see \code{\link{yule}}).
+}
+\author{Emmanuel Paradis}
+\references{
+ Hubert, N., Paradis, E., Bruggemann, H. & Planes, S. (2011) Community
+ assembly and diversification in Indo-Pacific coral reef
+ fishes. \emph{Ecology and Evolution} (in press).