Posted on 11/27/2024 10:40:54 AM PST by Red Badger
Like yin and yang: the tarantula's gynandromorphism can be seen with the naked eye.
Image courtesy of Fernando Pérez-Miles and Álvaro Laborda
The stunning specimen you can see above was the first documented instance of a tarantula with gynandromorphic characteristics: one side of its body is female, while the other is male.
The case first came to light in 2014 at a lab at the University of the Republic in Uruguay when a team of bug experts was observing a bunch of orange baboon tarantulas (Pterinochilus murinus) that had just molted into adulthood.
After emerging from its former exoskeleton, one individual revealed a particularly interesting appearance. Perfectly split down the middle, the right side was hairier and had slightly chunkier limbs while its left side was barer and skinnier. A closer inspection revealed that the right side of the body was female, while the left side was male.
This is known as gynandromorphism, a genetic condition in which an organism is born with both male and female characteristics. It’s been reported in a variety of different animals, from stick insects and bees to an array of birds, but this was the first time it had been scientifically documented in a Mygalomorphae tarantula.
Initially, all seemed perfectly well with the unique tarantula and the researchers noted that the individual was seemingly unaffected by its condition.
“The gynandromorphic tarantula walked and fed normally. At least, we did not perceive any difficulty in its everyday behaviors,” Fernando Pérez-Miles, study author and entomologist at the University of the Republic, told IFLScience.
However, as it aged, some problems started to arise.
“There are several peculiarities in the gynandromorph. In tarantulas, males do not continue to molt after their maturation, when their sexual organs, palpal bulbs, emerge. This is due to a morphological constriction, as the shape of the palpal bulb would make it difficult to molt those organs. However, females continue to molt after reaching maturity. The gynandromorph underwent a molt after the maturation molt, and its male sexual organ suffered a deformation,” explained Pérez-Miles.
The researchers also noted that the gynandromorph individual was vulnerable to aggression from others, although that’s perhaps not too surprising since the species is known for its feisty behavior.
“Another peculiarity was that we experimentally confronted the gynandromorph with females on four occasions; on none of these occasions did it court, nor did the females show any sexual response. In one encounter, the gynandromorph was attacked by a female, who injured one of its legs,” he added.
Despite these difficulties, the individual managed to live to a relatively normal age.
It’s not perfectly clear what causes gynandromorphism in any species, although it’s known to occur due to abnormal cell division and the segregation of the sexual chromosomes during early development.
In animals that use X and Y chromosomes to determine an individual's biological sex (females typically with XX and males typically with XY), some gynandromorphic individuals will have some cells that may carry an X chromosome from one parent, while others may have a Y chromosome from the other parent. This results in mosaicism, in which cells within the same person have a different genetic makeup.
Spiders have significantly more complex sex chromosome systems, with varying compositions of sexual chromosomes across different species. This complexity had previously led scientists to assume that gynandromorphy was extremely rare in tarantulas. However, as always, nature is full of surprising exceptions to the rule.
The case study was first reported in The Journal of Arachnology in 2017.
The results of too many Heshe bars.
“Glorious is a really peculiar word to use in describing a hideous freak of nature.”
God made it.
Now what are you going to do?
the new star of the spiderman series...
It doesn’t seem to elicit any sexual interest at all...
Why is there no Spidergirl?............
It’s a form of bilateral chimerism. Mutations of all sorts occur continuously in the biological world, from factors such as environmental stress, mutagens, radiation etc, and most do not confer adaptive advantages, but every now and then it does, then you have a major component of biological evolution as it currently understood.
Glen or Glenda?
I does prove evolutionary variation.
Evolutionary variation exists in the human species.
I’m not sure you’re qualified to judge variation that makes you uncomfortable.
If we can agree human variation exists in emotional sensitivities and sexual orientation, it’s a starting point.
To the larger issue of policy.
In the case of transgender girls/women (biological males who’s orientation leans toward female sensitivities) do not belong in:
Women’s bathrooms
Women’s changing rooms
Women’s locker rooms
Nor do they belong on women’s sports teams because they are biologially 30% stronger and are therefor a danger to women completitors AND this unfair advantage robs women of historic achievement and the confidence and glory that go with it.
Schools should not take any action other than providing a safe environment for children who are identifying as the opposite gender, boys or girls. Instead they should provide support to the parents who find themselve wrestling with the situation.
No child should be given hormone treatments, puberty blockers or have access to gender reassignment surgery until they reach the age of majority.
However, as a society my firm belief is the variation is real and irreversible and I would rather except this reality than force a child to be what they are not and put them on a path to suicide.
So it can literally go F#ck itself?
So, what are its pronouns?
Several answers flashed through my "mind" ...
None of them come close to even remotely resembling ANYTHING fit for posting on FR.
Does that make me a bad person?
No, you’re normal... 😉
32 responses and nobody blames climate change?
Climate change. Definitely Climate change. We are all doooooommmmmed!!!!
I disagree
Evolutionary variation would require that the tarantula in question would have successfully reproduce.
As stated in the article other tarantulas were not interested in mating with the tarantula. And after molting its sex organs were deformed.
"... and listen, bitch, you keep your hairy ass outta my web "
The female is chunkier and hairier than the male? I've known some like that.
This stuff has always happened. Sometimes Nature just goes, ‘Ooops!’
(We used to have someone here on FR with a two-headed turtle...)
she grew up to become spider woman...
Does it squat to pee or lift its leg? In case of the latter, which leg is lifted?
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