Romano Dallai / University of Siena Zorotypus impolitus
Sex sex cells and the unique behavior of the soil mite species "Zorotypus impolitus" As stated in the May 2013 issue of the journal Naturwissenschaften. Romano Dallai scientists and colleagues from the University of Sinea, Italy revealed that the infestation of soil types Zorotypus impolitus only produces one sperm every time you make a marriage. What is unique is the size of the sperm produced by the same body length of about 3 millimeters.Sperm are produced in the spermatopora wrapped. Sperm size up to 3 mm, Z impolitus turns spermatopora size is about 0.1 mm. Spermatopora other insects generally have about 2 millimeters. Spermatopora Z. spermatopora impolitus is the smallest compared to other types of insects.
Laboratory research conducted ole Dallai and his team by placing colonies Z. impolitus in the laboratory and observed sexual behavior and sperm and spermatoporanya. From the research, they realized that Z. impolitus contrast to insects in general.
Zorotypus impolitus included in order Zoraptera; class of winged insects (Pterygota) the class of winged soil infestation. Another name is Zorotypus impolitus angel insects.
Generally males are winged insects, the mating process is done by transferring the sperm directly into the female genital tract. But on different impolitus Zorotypus, the difference occurs in the process of sperm transfer is done externally. The trick is putting insect male sperm and female insects on the ground pick it up. As quoted by the New Scientist, Friday (24/05/2013).
Dallai also explained that the marriage is performed by Zorotypus impolitus actually left a lot of insects, but the way this species transferring sperm could be a representation of the stages of evolution of coitus or copulation.
Insects Zorotypus impolitus already more advanced than Collembola insects, while the male fruit flies ahead of Zorotypus impolitus. The process of insect mating fruit flies by putting the sperm in the female genitalia, while the remaining part outside the insects eaten by the female.
Unique from insects Zorotypus impolitus not only the sperm laying on the ground but the behavior of female insects are aroused male insects will approach then rub - rubbing with antennae. If bersedian male insects to mate the male will move to the back of the female, a little dancing, moving back and forth, bowed his head, and moving the antenna. Pinnacle process of mating when the male slipped under the female for a few seconds and put spermatopora in his stomach. When likened humans, this stage is the stage of ejaculation.
Related to the amount of sperm that there is only one and a gigantic, Dallai feel weird because males must try her best to be able to successfully fertilize females. Why not produce a lot of sperm so that if one fails there are other sperm that will fertilize?.
But according Dallai that the size of the sperm will meet the female reproductive tract, so the production line clogged female insects. The blockage resulted in no other male insects which fertilize. By providing a single sperm to the female allows the male insects still have a chance to fertilize another female insects.
Sources:
http://new scientist /
www.htysite.com
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