Animals Biology Donald Winslow 8 April 2011. Kingdom Animalia Sponges (invertebrate) Radially symmetrical animals (invertebrate) Bilaterally symmetrical.
Chordates Zoology Donald Winslow 4 April 2008 Following Hickman et al. 2008, Ch 23 pp 497-506, 508-510, 512 (protochordates & early vertebrates) Ch 24.
