ScienceSex reversal: Neotrogla females have spiny penis, can copulate for nearly 3 days Scientists have found strange cave insects in Brazil that exhibit sex reversal. The females of this strange insect group have spiny "penises" while the males have vagina-like openings.by Alexander Saltarin
ScienceNeotrogla females have penis, can have sex for up to 70 hours: Discovery of Brazilian insect stuns scientistsby Jim Algar
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