Brunetti, R. , Gissi, C. , Pennati, R. , Caicci, F. , Gasparini, F. and Manni, L.
J Zoolog Syst Evol Res, 2015, 53: 186-193. doi:10.1111/jzs.12101
Morphological evidence that the molecularly determined Ciona intestinalis type A and type B are different species: Ciona robusta and Ciona intestinalis.