The animal kingdom is rife with dissimilar mechanisms for intimate reproduction , but the one we are most familiar with ( as it was so articulately stated inKindergarten Cop ) is that boys have a penis , and girls have a vagina . distaff hyena have pseudopenises , but that ’s mostly just for show . There have not been any known species where the female naturally has a dead on target , running phallus until now .
However , male and distaff is n’t defined by genitals , it ’s delineate by gametes . Males produce sperm , female create testis .
In a cave in Brazil , an insect has been discovered that hascompletely swapped genital organ . The new genus has been dubbedNeotrogla , and the worm themselves are about 3 millimeter long and kind of take care like flies . Not only does this female have such a relatively large piece ( called a gynosome ) but she cognize how to use it . The consequence of this find have been publish inCurrent Biology .
When it is time to mate , the distaff riding horse the male , inserts her gynosome into his vagina - corresponding genitalia , and they begin a carnal knowledge seance that is about 40 - 70 HOURS long . After it has been inserted , the gynosome curves inside of the male , locking the two together . This connective is so strong that a researcher who tried to pull the two asunder during the deed actually ripped the male ’s organic structure in half , but did n’t divide their genitals .
When the male transfers ejaculate over to the female , it is believed to number with loading of nutrients to help the female with the bollock . In cave where food is n’t always plentiful , that can be a huge prize to be won for the female , and is very taxing for the male . As a result this has causedNeotroglafemales to contend for male to get those precious resources .
Typically in the animal land , the male person is capable to make and spread gametes like unhinged , since most male do n’t play any role in rearing their offspring . For the female person , it ’s much more energetically tax to make testis and manage for them , leaving the females to be choosy about their partners . This is countermand inNeotrogladue to that nutritionary gift from the male to the female person , leading the male person to be more selective about his mates . The researchers conceive that this extreme choosiness in reality led to the eventual reversal of the genital organ .
Graphical outline from the paper :
figure of speech credit entry : Yoshizawa et al . , Current Biology ( 2014 )
