| 1. | The hectocotylus when found in females was originally described as a parasitic worm.
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| 2. | The hectocotylus is on the third arm.
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| 3. | Top image : Tip of hectocotylus with the penis-sac collapsed and penis extended.
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| 4. | The males use a modified arm, the hectocotylus, to transfer sperm to the female.
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| 5. | One of the ventral arms develops into a secondary sexual organ ( the hectocotylus ) in males.
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| 6. | The males have a large arm in a spherical pouch modified for mating, known as a hectocotylus.
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| 7. | Robson also noted a significant difference in the hectocotylus in Chun's specimen and those in his specimens.
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| 8. | Bottom image : Detached hectocotylus with most of the penis in the penis-sac and just the tip of the penis emerging.
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| 9. | During copulation, a male grasps the female and inserts the hectocotylus into the female's mantle cavity where fertilization usually occurs.
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| 10. | During copulation of some cephalopod species, the hectocotylus transfers the spermatophore from Needham's sac into the mantle cavity of the female.
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