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Lecture 5 Animal Evolution – The Invertebrates

Lecture 5 Animal Evolution – The Invertebrates. Mollusks . 5. Mollusks. Bilaterial, soft-bodied animals with a small coelom. Most have calcium carbonate shell & proteins secreted from the cells of a tissue that drapes like a skirt over the body mass - known as mantle .

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Lecture 5 Animal Evolution – The Invertebrates

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. Mollusks

  3. 5. Mollusks • Bilaterial, soft-bodied animals with a small coelom. • Most have calcium carbonate shell & proteins secreted from the cells of a tissue that drapes like a skirt over the body mass - known as mantle. • Gill - organ used for gas exchange. • Most have fleshy foot. • Many have radula • Radula: • tounge-like, toothed organ that rasps algae & other organisms & draw them into the mouth. • Size ranges from tiny snail to giant predators.

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