Animal Classification

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Animal classification is the formation of groups and sub-groups of animals based on similarities and differences. It makes studying the vast variety of animals easier, helps understand evolution, enab

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Aristotle, the Greek philosopher, was the first to perform animal classification. He classified animals based on body size, habits, and habitats. This was known as the 'Artificial method' of classific

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1. Grades of organization (cellular, tissue, organ, organ-system) 2. Body symmetry (asymmetrical, radial, bilateral) 3. Germ layers (diploblastic or triploblastic) 4. Body cavity/coelom (acoelomate, p

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Diploblastic animals have two germ layers (endoderm and ectoderm) formed during embryonic development. Example: Cnidarians like Hydra. Triploblastic animals have three germ layers (endoderm, ectoderm,

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Acoelomate: No body cavity (Porifera, Cnidaria, Platyhelminthes) Pseudocoelomate: Body cavity not formed from mesoderm (Aschelminthes) Eucoelomate: True body cavity formed from mesoderm (Annelida and

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1. Simplest body plan (sponges) 2. Numerous pores (ostia and oscula) 3. Aquatic, mostly marine 4. Asymmetrical body 5. Collar cells present 6. Sedentary (attached to substratum) 7. Supported by spicul

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Key features: Radially symmetrical, diploblastic, cnidoblast-bearing tentacles, mostly marine. Polyp: Cylindrical body form (like Hydra) Medusa: Umbrella-like body form (like Jellyfish) Examples: Hydr

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Called flatworms because their body is slender and flat like a leaf or strip. Characteristics: 1. Most are endoparasites 2. Acoelomate and bilaterally symmetrical 3. Triploblastic 4. Hermaphrodite (bo