The Invertebrates- Chapter 7

Phylum Porifera- sponges Cellular organization No tissues or organs Types of cells Pinacocytes and porocytes Choanocytes Amebocytes Suspension feeders Reproduction- asexual and sexual. ~6,000 species. Habitat- predominantly marine. Examples- Ophlitaspongia and Haliclona.

Sponge Anatomy

Asexual Reproduction

Sexual Reproduction

Feeding

3 Sponge Classes Calcarea- calcareous sponges. Hexactinellida- glass sponges. Demospongiae- bath sponges.

Phylum Cnidaria- cnidarians Tissue level organization Epidermis Cnidocyte with nematocyst Epitheliomuscular cells Gastrodermis Gland cells Nutritive-muscular cells Mesoglea- jellylike middle layer. Carnivores Reproduction- asexual and sexual. Radial symmetry. ~10,000 species. Habitat- predominantly marine. Examples- Physalia, Aurelia, and Anthopleura. -Sensory cells -Sensory cells

Radial Symmetry

Cnidarians Are Carnivores

Nematocyst Stings

Medusae Ovary Testis Feeding polyp Sperm Medusa bud Egg Zygote Reproductive Polyp Planula Mature Colony Settles on substrate Young Colony

3 Major Cnidarian Classes Hydrozoa- hydroids and jellies. Scyphozoa- jellies. Anthozoa- anemones and corals.

Colonial Hydrozoans

Colonial Anthozoans

Phylum Ctenophora- comb jellies

Phylum Mollusca- molluscs System level organization. Foot, mantle, radula. Gills. All diets. Reproduction- sexual, external and internal. Bilateral symmetry. ~200,000 species. Habitat- predominantly marine. Examples- Haliotis, Mytilus, and Loligo.

Radula- designed for removing food from surfaces, made of chitin.

Gastropoda- snails, limpets, abalone, nudibranchs.

Bivalvia- clams, mussels, oysters.

Cephalopoda- squid, cuttlefishes, nautilus, and octopuses.

Polyplacophora- chitons.