Dark field microscopy of Dendrocoelum lacteum, an aquatic Triclad flatworm. Flatworms are primitive, bilaterally symmetrical animals which show the beginnings of a head and true organs. However, the mouth is still the only opening into the gastric system and there are no circulatory systems apart from the gut; there is a primitive brain and nervous system. HFW = 9mm (contracted).
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TOP22235086
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達志影像
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