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=== Phallus ===
 
=== Phallus ===
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* Ventral proctodeum is modified and thickened into a single phallus.
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* Two pairs of fibrous tissue separated by a central trough.
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* Cannot be inverted (unlike lizards and snakes).
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* Highly vascular.
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* When inserted into the female cloaca it becomes engorged.
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* Semen is conveyed through the central sulcus.
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* A retractor muscle returns the phallus back into the cloaca.
    
== Female ==
 
== Female ==
    
== Copulation ==
 
== Copulation ==
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