Genetics triggers male black widows to blackflip into death, study finds

A recent study reveals that male black widow spiders undergo a peculiar survival tactic during mating, flipping into females' fangs to prolong the encounter. This behavior, known as "blackflipping," is also accompanied by abdominal constriction, which researchers believe helps the males survive the act of being eaten alive. However, a close relative of the redback spider from New Zealand, the katipō, does not exhibit these behaviors.

The researchers hypothesized that the genetic basis for this unique mating ritual could be explained by examining the genetics of hybrid males, which are a result of mating between redback and katipō spiders. They found that the backflipping behavior is linked to the X chromosome, while abdominal constriction shows a more complex genetic pattern, with potential influences from multiple genes or female behavior.

The study provides insight into the unusual mating behaviors of these closely related spider species and opens the door for further comparative studies among the genus Latrodectus.