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

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