Was the common ancestor of bilaterally symmetrical animals segmented - Biology bibliographies - in Harvard style

In-text: (Davis and Patel, 1999)

Your Bibliography: Davis, G. and Patel, N., 1999. The origin and evolution of segmentation. Trends in Genetics, 15(12), pp.M68-M72.

In-text: (Guruharsha, Kankel and Artavanis-Tsakonas, 2012)

Your Bibliography: Guruharsha, K., Kankel, M. and Artavanis-Tsakonas, S., 2012. The Notch signalling system: recent insights into the complexity of a conserved pathway. Nat Rev Genet, 13(9), pp.654-666.

In-text: (Moreno-Risueno et al., 2010)

Your Bibliography: Moreno-Risueno, M., Van Norman, J., Moreno, A., Zhang, J., Ahnert, S. and Benfey, P., 2010. Oscillating Gene Expression Determines Competence for Periodic Arabidopsis Root Branching. Science, 329(5997), pp.1306-1311.

In-text: (Peel, 2014)

Your Bibliography: Peel, A., 2014. GtR. [online] Gtr.rcuk.ac.uk. Available at: <http://gtr.rcuk.ac.uk/project/E4BB77D4-A42C-4E34-8026-F730B029C02B> [Accessed 16 February 2015].

In-text: (Sarrazin, Peel and Averof, 2012)

Your Bibliography: Sarrazin, A., Peel, A. and Averof, M., 2012. A Segmentation Clock with Two-Segment Periodicity in Insects. Science, 336(6079), pp.338-341.