Review Questions 1) What are 4 characteristics that all animals share? 2) Contrast invertebrates with vertebrates 3) What is the difference between the blastula and gastrula stages of development in most animals?

Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria Platyhelminthes Nematoda Annelida Mollusca Echinodermata

Invertebrates II Porifera (sponges) lack true tissue (organs) mostly marine Sessile body: sac with pores feeding: filter thru pores no nervous system asexual OR sexual reproduction

Invertebrates II Filter Feeding Collar Cells- contain flagella that pulls water in and traps food Amoebocytes- engulfs the food (mostly bacteria) Feeding Animation

Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria Platyhelminthes Nematoda Annelida Mollusca Echinodermata

Invertebrates II Cnidaria jellyfish, hydras, sea anemones, coral Sessile or slow-moving digestive sac (1 opening) Carnivorous Radial symmetry www.phsuccessnet.com

Invertebrates II Cnidaria cnidocytes w/ nematocysts: disable/sting prey simple nerve net to respond to stimuli basic specialized tissue www.phsuccessnet.com

Invertebrates II 2 forms: polyp & medusa

Killer Jellyfish Stinging animation Video trailer

Online Activities Phsuccessnet.com 23.1 Characterize animals 23.2 Explore sponges 23.3 Explore cnidarians

Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria Platyhelminthes (flatworms) Nematoda Annelida Mollusca Echinodermata

Invertebrates II Platyhelminthes (flat worms) examples: planaria, tapeworms & flukes (parasites) bilaterally symmetric has muscle tissue nerve clusters gastrovascular cavity w/ one opening asexual OR sexual; hermaphroditic www.phsuccessnet.com

Invertebrates II Platyhelminthes acoelomate moves directionally no need for circ. system b/c of flat shape has head w/ eyespots

Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria Platyhelminthes (flatworms) Nematoda (round worms) Annelida Mollusca Echinodermata

Invertebrates II Nematoda (roundworms) bilaterally symmetric complete digestive tract (2 openings) important decomposers causes trichinosis in humans pseudocoelom www.phsuccessnet.com

Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria Platyhelminthes (flatworms) Nematoda (round worms) Annelida (segmented worms) Mollusca Echinodermata

Invertebrates II Segmented worms (earthworms, tubeworms, leeches, etc.) coelom complete digestive system with surrounding closed circulatory system digestive system has specialized regions has tubes for removing waste from blood brainlike structure Worm Video www.phsuccessnet.com

Earthworm Dissection Dorsal (back)/ Ventral (front) Anterior (top)/ Posterior (bottom) Segments/ Setae/ Nephridiopores Clitellum

Earthworm Dissection Place on ventral (flattened) side Make a thin cut in the middle from clitellum to mouth Pin down sides.

Earthworm Dissection Septa Digestive System Hearts Cerebral ganglia (brain)/ Ventral Nerve Cord Seminal Vesicles

Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria Platyhelminthes (flatworms) Nematoda (round worms) Annelida (segmented worms) Mollusca Echinodermata

Invertebrates II Mollusks snails, slugs, oysters, clams, octopi, squid, etc, coelomates open circulatory system

Body of a Mollusk Foot- locomotion Mantle- produces shell; respiration; waste disposal, sensory reception; (gill) Radula- extends from mouth to feed

Diversity of Mollusks Gastropod- single, spiral-shaped shell, mostly marine; snails & slugs Bivalves- shells with 2 halves; clams, oysters, mussels, scallops Cephalopods- fast, agile, shell is small and internal or missing; squid, octopi

What mollusk class am I??

What mollusk class am I??

What mollusk class am I??

Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria Platyhelminthes (flatworms) Nematoda (round worms) Annelida (segmented worms) Mollusca Echinodermata (starfish, etc)

Invertebrates II Echinoderms lack body segments, and in most adult forms, the external parts of the animal radiate from the center like spokes of a wheel (radial symmetry) Rough & spiny surface

Invertebrates II Hard internal skeleton (endoskeleton) deuterostomes water vascular system tube feet for moving, gas exchange, eating

Invertebrates II Echinoderms sexual reproduction (sperm/eggs in water) regenerate examples: sea stars, brittle stars, sea urchins, sand dollars, sea lillies, sea cucumbers, sea daisy

Review Log on to phsuccessnet.com and complete online activities 23.7 and 23.8. When complete, write a summary paragraph on what you learned in each activity.

Mussel Dissection Mussel Dissection

Starfish Dissection Aboreal/ oral surfaces