Hemipénis

Hemipênis de uma cascavel da espécie Crotalus atrox

Um hemipênis é um par de órgãos copulatórios de escamados machos (cobras, lagartos e anfisbena).[1][2]

Os hemipénis estão usualmente invertidos, dentro do corpo, e são expostos para a reprodução por meio de tecido eréctil como o pénis humano.[3] Apenas um é usado de cada vez, e há algumas evidências que os machos alternam o seu uso entre copulações. O hemipênis em si tem uma variedade de formas, dependendo da espécie. Por vezes o hemipênis comporta espinhos ou ganchos, para ancorar o macho dentro da fêmea. Algumas espécies têm até hemipénis biforcados (cada hemipênis tem duas pontas). Por estarem invertidos e terem de se reverter, os hemipênis não têm um canal completamente fechado para a condução do esperma, mas antes uma fenda seminal que fecha quando o tecido eréctil expande.

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Referências

  1. «Hemipenes» 
  2. Holmes MM, Putz O, Crews D, Wade J (2005). «Normally occurring intersexuality and testosterone induced plasticity in the copulatory system of adult leopard geckos». Horm Behav. 47 (4): 439–45. PMID 15777809. doi:10.1016/j.yhbeh.2004.11.020 
  3. «Iguana Anatomy» 
  • Este artigo foi inicialmente traduzido, total ou parcialmente, do artigo da Wikipédia em inglês cujo título é «Hemipenis», especificamente desta versão.
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