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Palabras clave
vesícula seminal
espermatogénesis
madurez sexual
testículos
gusano de terciopelo
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Resumen
Examinamos el desarrollo del tracto reproductivo masculino de una población de onicóforos de la cordillera Oriental colombiana para describir las características macroscópicas e histológicas durante el desarrollo embrionario tardío en neonatos y en machos de diferentes tamaños corporales recolectados en campo. Describimos la anatomía general del sistema reproductivo y encontramos que es similar a la conocida en otras especies de la familia. Durante el desarrollo intraoviductal se alcanzó la diferenciación morfológica completa del sistema reproductivo en los embriones machos del estado embrionario VII, ubicados en la porción más distal del oviducto ascendente de la madre. Los embriones alojados en la región anterior del oviducto descendente materno exhibían cuerpos parcialmente pigmentados y espermiogénesis activa, aunque sin producción de espermatozoides aún. Los embriones pigmentados avanzados, localizados más distalmente en el oviducto descendente materno, producían espermatozoides y por ello se clasificaron como individuos maduros, aunque no reproductivamente activos, ya que carecían de espermatóforos en la luz del conducto deferente. Los recién nacidos y machos de todos los tamaños eran reproductivamente activos en potencia, lo que se evidenciaba por la producción continua de espermatozoides y la formación de espermatóforos listos para su transferencia al gonoporo de la hembra.
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