Phylogenetic comparative methods (PCMs) are a branch of statistics focused on modeling evolutionary data (i.e., data on species' characteristics and phylogenetic relationships). I have found 24 questions by searching phylogen* (4 in 2012, 6 in 2013, 6 in 2014, 6 in 2015, and 2 so far this year). Stack Overflow already has a [phylogeny] tag that has been used 101 times, although it seems to be underused since searching phylogen* returns 404 questions. I would personally subscribe to a [phylogeny] tag, but as I am new here, I am not sure if 6 questions trickling in per year would be deemed worthy of a tag. What do people think, phylogeny tag or no?
As an aside, I am very surprised that the PCM community hasn't tapped into Cross Validated more. I have been encouraging colleagues to come here because although there is R-sig-phylo, I think there is space for a forum where beginner to expert level PCM users can help each other with problems of varying difficulty. I'd describe myself as an advanced user, not expert, but I spend a lot of time helping beginner to intermediate level users who don't feel comfortable posting to R-sig-phylo. I think it would be great if more of that could take place in a forum like this.