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Invertebrates

Delve into the fascinating world of invertebrates, from the diverse body plans of cnidarians to the development of mollusks and the unique appendages of arthropods. Explore the key characteristics of different phyla and classes within the invertebrate kingdom.

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Invertebrates

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  1. Invertebrates Biology for Majors

  2. Sponge Morphology

  3. Cnidarians

  4. Cnidarians: Two Body Plans Cnidarians have two distinct body plans, the medusa (a) and the polyp (b). All cnidarians have two membrane layers, with a jelly-like mesoglea between them

  5. Polymorphic Cnidarians

  6. Class Anthozoa

  7. Class Scyphozoa

  8. Lifecycle

  9. Class Cubozoa

  10. Class Hydrozoa

  11. Phylum Platyhelminthes

  12. Phylum Rotifera

  13. Phylum Nemertea

  14. Phylum Mollusca

  15. Practice Question What traits in the diagram on the last slide does the aquatic gastropod pictured share with other mollusks?

  16. Mollusk Development: Torsion

  17. Phylum Annelida

  18. Phylum Nematoda

  19. Phylum Arthropoda

  20. Subphylum Hexapoda

  21. Subphylum Myriapoda

  22. Subphylum Crustacea

  23. Arthropod Appendages Arthropods may have (a) biramous (two-branched) appendages or (b) uniramous (one-branched) appendages.

  24. Larval Stages in Crustaceans

  25. Subphylum Chelicerata • Body divided into two parts: prosoma and opisthosoma • The first pair of appendages are the the chelicerae, specialized, claw-like or fang-like mouthparts

  26. Phylum Echinodermata

  27. Quick Review • What are the common characteristics of phylum Porifera? • What are the common characteristics of phylum Cnidaria? • What are the common characteristics of superphylumLophotrochozoa? • What are the common characteristics of superphylumEcdysozoa? • What are the common characteristics of superphylumDeuterostomia?

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