Here are the notes in a flashcard-friendly format:

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Phylum Porifera:

- Symmetry: Asymmetrical

- Cephalization: None

- Gut Type: None

- Body Cavity: None

- Segmentation: None

- Tissues: Cellular level

- Development: Minimal

- Reproduction: Asexual (budding), Sexual (hermaphrodites)

- Special Features: Choanocytes (collar cells)

- Examples: Bath sponge (*Spongia*), Glass sponge (*Euplectella*), Calcareous sponge (*Grantia*)

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Phylum Cnidaria:

- Symmetry: Radial

- Cephalization: None

- Gut Type: Sac-like

- Body Cavity: Acoelomate

- Segmentation: None

- Tissues: Diploblastic (epidermis, gastrodermis, mesoglea)

- Development: Indirect, radial cleavage

- Reproduction: Asexual (budding), Sexual

- Special Features: Nematocysts (stinging cells)

- Examples: Jellyfish (*Aurelia*), Sea anemone (*Actinia*), Coral (*Acropora*)

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Phylum Platyhelminthes:

- Symmetry: Bilateral

- Cephalization: Present

- Gut Type: Sac-like

- Body Cavity: Acoelomate

- Segmentation: None

- Tissues: Triploblastic

- Development: Protostome, spiral cleavage, direct or indirect

- Reproduction: Sexual (hermaphroditic)

- Special Features: Regeneration abilities

- Examples: Planarian (*Dugesia*), Tapeworm (*Taenia*), Fluke (*Schistosoma*)

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Phylum Rotifera:

- Symmetry: Bilateral

- Cephalization: Present

- Gut Type: Tubular

- Body Cavity: Pseudocoelomate

- Segmentation: None

- Tissues: Triploblastic

- Development: Protostome, spiral cleavage, direct

- Reproduction: Sexual, Asexual (parthenogenesis)

- Special Features: Corona (ciliated structure)

- Examples: Philodina, Brachionus, Asplanchna

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Phylum Annelida:

- Symmetry: Bilateral

- Cephalization: Present

- Gut Type: Tubular

- Body Cavity: Coelomate

- Segmentation: Present

- Tissues: Triploblastic

- Development: Protostome, spiral cleavage, direct or indirect

- Reproduction: Sexual (some hermaphroditic)

- Special Features: Setae (bristles)

- Examples: Earthworm (*Lumbricus*), Leech (*Hirudo*), Polychaete worm (*Nereis*)

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Phylum Mollusca:

- Symmetry: Bilateral

- Cephalization: Present

- Gut Type: Tubular

- Body Cavity: Coelomate

- Segmentation: Reduced

- Tissues: Triploblastic

- Development: Protostome, spiral cleavage, direct or indirect

- Reproduction: Sexual (some hermaphroditic)

- Special Features: Mantle, radula

- Examples: Snail (*Helix*), Clam (*Mercenaria*), Octopus (*Octopus*)

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Class Gastropoda (within Mollusca):

- Symmetry: Bilateral

- Cephalization: Present

- Gut Type: Tubular

- Body Cavity: Coelomate

- Segmentation: None

- Tissues: Triploblastic

- Development: Protostome, spiral cleavage, direct or indirect

- Reproduction: Sexual (many hermaphroditic)

- Special Features: Torsion

- Examples: Garden snail (*Helix aspersa*), Slug (*Limax*), Conch (*Strombus*)

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Class Bivalvia (within Mollusca):

- Symmetry: Bilateral

- Cephalization: Reduced

- Gut Type: Tubular

- Body Cavity: Coelomate

- Segmentation: None

- Tissues: Triploblastic

- Development: Protostome, spiral cleavage, indirect

- Reproduction: Sexual

- Special Features: Two-part shell, filter feeding

- Examples: Blue mussel (*Mytilus edulis*), Oyster (*Ostrea*), Scallop (*Pecten*)

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Class Cephalopoda (within Mollusca):

- Symmetry: Bilateral

- Cephalization: Significant

- Gut Type: Tubular

- Body Cavity: Coelomate

- Segmentation: None

- Tissues: Triploblastic

- Development: Protostome, spiral cleavage, direct

- Reproduction: Sexual

- Special Features: Highly developed nervous system

- Examples: Octopus (*Octopus*), Squid (*Loligo*), Cuttlefish (*Sepia*)

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Phylum Nematoda:

- Symmetry: Bilateral

- Cephalization: Present

- Gut Type: Tubular

- Body Cavity: Pseudocoelomate

- Segmentation: None

- Tissues: Triploblastic

- Development: Protostome, eutely, direct

- Reproduction: Sexual (some hermaphroditic)

- Special Features: Cuticle, longitudinal muscles

- Examples: Vinegar eel (*Turbatrix aceti*), Hookworm (*Ancylostoma*), Caenorhabditis elegans

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Phylum Arthropoda:

- Symmetry: Bilateral

- Cephalization: Present

- Gut Type: Tubular

- Body Cavity: Coelomate

- Segmentation: Present

- Tissues: Triploblastic

- Development: Protostome, spiral cleavage, direct or indirect

- Reproduction: Sexual

- Special Features: Exoskeleton, jointed appendages

- Examples: Insects (e.g., Drosophila), Spiders (*Araneae*), Crustaceans (e.g., Homarus)

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Class Polyplacophora (within Mollusca):

- Symmetry: Bilateral

- Cephalization: Reduced

- Gut Type: Tubular

- Body Cavity: Coelomate

- Segmentation: Present

- Tissues: Triploblastic

- Development: Protostome, spiral cleavage, direct

- Reproduction: Sexual

- Special Features: Eight-plated shell

- Examples: Chiton (*Chiton*), Lepidochitona

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These flashcards summarize the key characteristics and examples of each invertebrate phylum and class, providing a quick and easy way to study the information.