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Digenea
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====Male organs==== [[Hermaphrodite|Protandry]] is the general rule among the Digenea. Usually two [[testes]] are present, but some flukes can have more than 100. Also present are [[vasa efferentia]], a [[vas deferens]], [[seminal vesicle]], [[ejaculatory duct]] and a cirrus (analogous to a penis) usually (but not always) enclosed in a cirrus sac. The cirrus may or may not be covered in proteinaceous spines. The exact conformation of these organs within the male terminal genitalia is taxonomically important at the familial and generic levels.
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