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Biology Yr 11
Classification of invertebrate groups
| Term | Definition |
|---|---|
| Porifera common term | sponges |
| Cnidaria common term | jellyfish, sea anemones, corals |
| Platyhelminthes common term | flatworms |
| Mollusca common term | molluscs, octopus |
| Annelida common term | segmented worms |
| Nematoda common term | round worms |
| Arthropoda common term | arthropod (spiders etc) |
| Echinodermata common term | starfish |
| Porifera feature 1 | Asymmetrical |
| Porifera feature 2 | body is multicellular, with a few tissues and no organs |
| Cnidaria feature 1 | simple, net-like nervous system |
| Cnidaria feature 2 | gastrovascular cavity with single opening that serves as mouth and anus |
| Platyhelminthes feature 1 | body has a blind gut (mouth and no anus) |
| Platyhelminthes feature 2 | body has three layers of tissue and no organs |
| Mollusca feature 1 | open circulatory system with heart and aorta |
| Mollusca feature 2 | uses muscular foot for locomotion |
| Annelida feature 1 | body has more than two cell layers, tissues and organs. |
| Annelida feature 2 | nervous system and closed circulatory system |
| Nematoda feature 1 | cylindrical morphology |
| Nematoda feature 2 | body covered in cough cuticle of collagen and chitin |
| Arthropoda feature 1 | hard exoskeleton |
| Arthropoda feature 2 | Segmented with jointed appendages |
| Echinodermata feature 1 | five-rayed symmetry, can be radial or bilateral |
| Echinodermata feature 2 | thin epidermis covering an endoskeleton - most species are spiky due to skeletal bumps and spines |
Created by:
Millie Cullender
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