1	Invertebrates Life Without a Backbone
2	"Invertebrates – animals that lack..." Invertebrates – animals that lack a backbone account for about 95% of the known animal species. They have adapted to just about every habitat on earth.
3	Review of animal phylogeny
4	Major Steps (grades) in the Evolution of the Animal Kingdom Step 1. The Parazoa-Eumetazoa split Parazoa lack true tissues Body cells relatively unspecialized Eg. Phylum Proifera - The Sponges The Eumetazoa are all the other animals with well developed tissues
5	Phylum: Porifera (Sponges)
6	Sponge Anatomy
7	The Eumetazoa Radiata-Bilateria Split Radiata - those animals with Radial Symmetry and are Diploblastic Eg. Phylum Cnidaria The Bilateria are all other animal groups which are Bilaterally symmetric and are Triploblastic
8	Body Symmetry
9	"Phylum" Phylum: Cnidaria – Corals, Jellyfish, Sea anemones, and Hydras
10	Phylum: Cnidaria There are two basic body forms in the Cnidaria
11	Cnidocyte
12	Cnidarian Diversity Hydrozoans Scyphozoans Cubozoans Anthozoans
13	Obelia sp. life cycle
14	Bilaterally Symmetrical Phyla The vast majority of animals belong to the clade Bilaterata – bilaterally symetrical animals. DNA evidence indicates that there are three major clades of bilaterata, Lophotrochozoa, Ecdysozoa, and Deuterostomia.
15	Triploblastic embryos Recall embryology and “Germ layers” Ectoderm - becomes outer surface and nervous tissues of the animal. Mesoderm - becomes muscles, skeleton connective tissues. Endoderm - becomes the lining of the digestive system (gut).
16	Lophotrochozoa Members of this group were identified but molecular data but many have one or other of two distinctive structures, the lophophore and the trochophore larva.
17	"The lophophore – is a..." The lophophore – is a crown of ciliated tentacles use for feeding, A distinctive developmental stage called a trochophore larva.
18	"Phylum" Phylum: Platyhelmenthes Flatworms Triploblastic animals with no internal fluid filled cavities, “acoelomate”.
19	Phylum: Platyhelmenthes Turbellarians Eg. Dugesia sp. (planarians)
20	"Life cycle of the trematode..." Life cycle of the trematode Schistisoma mansoni
21	"Class Cestoda - Tapeworms" Class Cestoda - Tapeworms
22	Rotifers True multicellular animals that inhabit freshwater, marine and damp soil habitats Pseudoceolome Alimentary canal, mouth – anus.
23	Lophophorates “Lophophore” – horseshoe or circular crown of ciliated tentacles surrounding the mouth. Three phyla – Ectprocts, Phoronids, and Brachiopods.
24	Nemerteans Probosis worms or Ribbon worms “Acoelomate”? Small fluid filled sac operates extensible probscis. Reduced coelome? Alimentary canal, closed circulatory system
25	Phylum Mollusca The molluscs are a divers group of marine, freshwater and terrestrial animals.
26	Molluscs Muscular foot Visceral mass Mantle (mantle cavity)
27	Chitons Marine Shell with eight plates Radula
28	Molluscs Gastropods
29	Molluscs Gastropods
30	Molluscs Bivalves
31	Molluscs Cephalopods
32	"Some Giant Squid are real..." Some Giant Squid are real sea monsters.
33	Phylum Annelida Annelida means “little rings” these are the segmented worms.
34	Oligochaetes
35	Annelids True Coelome Segmentation
36	Polychaetes Marine Tube worms “parapodia”
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38	Leeches