A robust molecular phylogeny of the Tricladida (Platyhelminthes: Seriata) with a discussion on morphological synapomorphies.
S Carranza, D T Littlewood, K A Clough, I Ruiz-Trillo, J Baguñà, and M Riutort
Proc Biol Sci. 1998 April 7; 265(1396): 631–640. PMCID: PMC1689013