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The male genitalia of both are similar, but Epiblema usually have a horn-like process on the margin of the basal cavity. Where this is missing (or very small) there may be a flap-like structure adorned with bristles called the pulvinus, which is usually absent or poorly developed in Eucosma. |
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Epiblema or Eucosma? |
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cucullus |
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sacculus |
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lobe (of cucullus) |
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Eucosma males |
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Epiblema males |