Higher-level metazoan relationships: recent progress and remaining questions

Edgecombe, GD., Giribet. G, Dunn. CW, Hejnol. A, Kristensen. RM, Neves. RC, Rouse. GW, Worsaae. K, and Sorensen. MV. 2011. “Higher-level metazoan relationships: recent progress and remaining questions.” Organisms, Diversity & Evolution 11: 151-172.