Notices. Mon Mar 13 Today. Topic 1 Animal diversity: part 2 Tomorrow: zoo field trip. Animal Diversity Car pool to zoo. Bring handout and a part 2 pencil or pen. Assemble at front gate at: Section 1 – 8.50 am Section 2 – 2.15 pm Textbook resources • pp. 517-522 • pp. 527-8 • p. 530 • pp. 531-2 Fig. 25.2 Phylogeny to know (1). Animal diversity, part 2 Critical innovations to insert: Diversity 2 I. Parazoa • ecdysis • mouth develops after II. Cnidaria & Ctenophora anus • multicellularity I. Outline the • symmetry unique III. Lophotrochozoa • tissues characteristics of sponges IV. Ecdysozoa 1 Parazoa Parazoa • Porifera: Sponges • Porifera: Sponges • Tissues? – Multicellular without tissues • Symmetry? – Choanocytes (collar • Germ Layers? cells) use flagella to • Embryonic move water and Development? nutrients into pores • Body Cavities? – Intracellular digestion • Segmentation? Fig. 25.11 Animal diversity, part 2 Parazoa Diversity 2 I. Parazoa • Porifera: Sponges – Hermaphrodites II. Cnidaria & Ctenophora – Sexual and asexual reproduction II. Outline the unique III. Lophotrochozoa characteristics of cnidarians and IV. Ecdysozoa ctenophores Coral Box jelly Cnidaria and Ctenophora • Cnidarians – Coral; sea anemone; jellyfish; hydra; box jellies • Ctenophores – Comb jellies Sea anemone Jellyfish Hydra 2 Comb jelly Cnidaria and Ctenophora Fig. 25.12 Coral Box jelly Cnidaria and Ctenophora • Tissues Fig. 25.12 • Symmetry Sea anemone Jellyfish Hydra Cnidaria Cnidaria • Body Cavities Fig. 25.12 • Nerve nets – Gastrovascular cavity for extracellular • Cnidocytes digestion Fig. 25.13 3 Ctenophora Ctenophora Mouth • Body Cavities • Nerve nets • 8 rows of cilia • Hermaphrodites – Complete gut Stomach • • Mouth and anus Bioluminescence Anal pore Animal diversity, part 2 Lophotrochozoa Diversity 2 I. Parazoa II. Cnidaria & Ctenophora III. Describe the distinguishing III. Lophotrochozoa features of two types of lophotrochozoans IV. Ecdysozoa Fig. 25.2 Lophotrochozoa Lophotrochozoa: Platyhelminthes • Diverse clade • Flatworms • Triploblastic • Lophophore: crown • Body cavities of ciliated tentacles • Trochophore: distinct larval stage with band of cilia 4 Lophotrochozoa: Platyhelminthes Lophotrochozoa: Platyhelminthes • Flatworms • Flatworms – Cephalization Fig. 25.15 – Hermaphrodites – Nerve net, but – Sexual or asexual reproduction beginnings of – centralized Many are parasites nervous system Fig. 25.17 Lophotrochozoa: Annelida Lophotrochozoa: Annelida • Segmented Worms • Segmented Worms • Double transport system • Ventral nerve cord • Primarily sexual reproduction Fig. 25.22 Animal diversity, part 2 Ecdysozoa Diversity 2 I. Parazoa II. Cnidaria & Ctenophora IV. Describe the distinguishing III. Lophotrochozoa features of one types of ecdysozoan IV. Ecdysozoa Fig. 25.2 5 Ecdysozoa Ecdysozoa: Arthropoda • Cuticle • Jointed appendages • Ecdysis Spider Ecdysozoa: Arthropoda • Thick cuticle prevents gas exchange • Tracheal system Millipede – Spiracles Centipede – Trachea Insect Crustacean Ecdysozoa: Arthropoda • Segmentation with specialization • Fusion of segments into tagmata – Head – Thorax – Abdomen • Extensive cephalization Fig. 25.26 – Sense organs 6.