锐刺大口虫奇异的交配习惯

Failing to find a mating partner is a dent¹ to the reproductive prospects² of any animal, but in the flatworm species Macrostomum hystrix it might involve a real headache. Zoologists³ from the Universities of Basel and Bielefeld have discovered the extraordinary lengths to which this animal is willing to go in order to reproduce - including apparently⁴ injecting sperm⁵ directly into their own heads. The academic journal Proceedings⁶ of the Royal Society B has published their findings. The absence of a mate usually spells disaster for sexually reproducing animals. However, some simultaneous hermaphrodites - animals who have both male and female sex organs at the same time - have developed an escape route for this scenario⁷: self-fertilization. It is an imperfect solution, as any offspring produced by so-called "selfing" are bound to be inbred, but still better than not reproducing at all.

 

In previous studies, it had been established that the flatworm species Macrostomum hystrix is capable of switching to just such selfing behavior when isolated⁸ from mating partners, a behavior found in many but not all simultaneous hermaphrodites. In their new study, Dr. Lukas Schärer from the University of Basel and his team now show the bizarre, yet remarkable⁹ mechanisms¹⁰ Macrostomum hystrix has developed that make this possible.

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