| 41. | As an example, more than eighteen species are known which parasitize digeneans ( parasitic flatworms ).
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| 42. | Although cotylean flatworms are conspicuous predators in subtropical and tropical ecosystems, they are difficult to study.
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| 43. | They are similar to the flatworms of the phylum Platyhelminthes, and were traditionally classified as such.
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| 44. | Finally, the adult flatworm typically inhabits the alimentary system or other body cavity of a fish.
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| 45. | "Convoluta convoluta " is a small flatworm of the class Acoela and family Convolutidae.
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| 46. | The sperm courses through the loose tissue of a flatworm's body until it reaches the ovaries.
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| 47. | Flatworms are acoelomates, lacking a body cavity, as are their closest relatives, the microscopic Gastrotricha.
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| 48. | Acoelomorphs resemble flatworms in many respects, but have a simpler anatomy, not even having a gut.
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| 49. | Like flatworms, they have no circulatory or respiratory systems, but they also lack an excretory system.
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| 50. | The ventral surface of the flatworm is a pale buff colour while the dorsal surface is dark brown.
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