Unusual-ology: Male Spiders Self Sacrifice for Better Offspring.

Unusual-ology is a new post type which focuses on weird new articles/science areas that have cropped up and caught my eye.

The practice of monogyny is found throughout the insect kingdom, especially arachnids. One such arachnid is the make dark fishing spider (Dolomedes tenebrosus). A recent study in Biology Letters has discovered that the male arachnid willingly sacrifices itself to the female to ensure that the resulting offspring is healthy; by providing itself as a meal for the female.

Video of the mating rituals and cannibalism from the experiment – Royal Society of Journals

Schwartz et al (2013) think that this practice of sexual cannibalism may provide an ‘evolutionary advantage’, because a better fed female is more likely to provide healthy descendants. But there are certain drawbacks to this practice; if a male dark fishing spider accidentally prematurely triggers one of their pedipalps, their two feeler-like appendages near the mouth where sperm is stored, they can die. Schwartz has encountered many problems during his experiment while catching the wild male specimens; they would accidentally snag their pedipalps on a piece of cotton which would cause them to die before the experiment could take place.


National Geographic. 2013. Male Spiders Self-Sacrifice, Lose Genitals. National Geographic News. Click here for the article.

Schwartz, S.K., Wagner Jr, W.E., Hebets, E., A. 2013. Spontaneous male death and monogyny in the dark fishing spider. Biology Letters. 9, 4. Click here for the journal.

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