1. Vertebrates and
Invertebrates

2. VERTEBRATES
 derived its name from vertebrae, the
series of bones that make up the
backbone or the vertebral column
 subphylum of Chordata, which are
bilaterally symmetrical
 Chordates are named for skeletal
structure, the notochord
 Notochord is a longitudinal, flexible,
rod located between the digestive tube
and the nerve cord

17. Invertebrates

25. SPONGES
 phylum Porifera
 suspension feeders living in both
 spongocoel pores in the central cavity
 osculum larger opening
 choanocytes collar cells (named for
the membranous collar around the base
of the flagellum
 consist of two layers
 Mesohyl gelatinous region
 Amoebocytes