Born of a virgin


Add hammerhead sharks to your list of animals that don’t need males. A captive bonnethead female in Nebraska gave birth in 2001, and genetic testing has revealed that it was produced by parthenogenesis. In a way, this isn’t a surprise: I could have told her that Nebraska is no place for a self-respecting shark to look for a boyfriend.

Parthenogenesis had been suspected, because the shark had been isolated from males for at least 3 years, and because she lacked the obvious bite marks that result from shark sex (which is another reason a lady shark might not want to have anything to do with sexual reproduction), and now the tests have shown it for sure. Nifty!

Comments

  1. Token says

    But… surely this is proof that Jesus was born the same way!

    Or at least that Jesus was a hammerhead shark. That would be much cooler than the crappy version in the bible.

  2. LTE says

    …because she lacked the obvious bite marks that result from shark sex (which is another reason a lady shark might not want to have anything to do with sexual reproduction)…

    What’s wrong with leaving a few bite marks?

  3. gg says

    #3: Can we make ‘Nemesis’ the official theme song for Pharyngula? I mean, “But you know evil is an exact science” sounds to me like something PZ would (sarcastically) say…

  4. J-Parrot Dog says

    From “Fins”
    Can’t you feel ’em circlin’, honey
    Can’t you feel ’em schoolin’ around
    Fins to the left, fins to the right
    You’re the only bait in town
    Oh oh
    Oh oh
    You got fins to the left, fins to the right
    You’re the only bait in town

    And can I please have another Margarita? Dos, Por favor?

  5. Tim says

    RickD:

    No! The moment I read your contribution I recognized that I was already hearing that song in my head!

    That is funny.

    Thanks.

  6. dorid says

    Don’t worry guys, we won’t be getting rid of you all yet. Some of us still need someone around to open the pickle jars…

  7. Renali says

    “What’s wrong with leaving a few bite marks?”

    Likewise, what’s wrong with a swift kick to the nut sack?

    Oh wait, you mean I should have *asked* if you wanted to be kicked first? Silly me.

    >:)

  8. David Marjanović says

    Or at least that Jesus was a hammerhead shark.

    Or female. Or both.

  9. David Marjanović says

    Or at least that Jesus was a hammerhead shark.

    Or female. Or both.

  10. Bert says

    This puts all those satirical jeezuz fish with fins and teeth in a whole new light.
    Bow doen before her toothy holyness.

  11. says

    Reply to #2
    In shark sex, presumedly since sharks first appeared, copulation usually involves the male biting the pectoral fin of the female in order to get into the appropriate position. From what can be observed, it’s always painful and involves lots of struggling.

  12. Rich says

    “I could have told her that Nebraska is no place for a self-respecting shark to look for a boyfriend.”

    I literally laughed out loud. She would do much better in the singles bars on the Upper West Side in NYC. OTOH the competition is pretty fierce there, cold-blooded predator wise. (And yes, I know that some sharks are endotherms.)

  13. EnoNomi says

    The new pup was soon killed by a stingray before keepers could remove it from its tank.

    Those Satin’s spawn devil stingrays killed our cartilaginous savior! The end is nigh!

  14. says

    But… surely this is proof that Jesus was born the same way!

    Or at least that Jesus was a hammerhead shark.

    Hey! Jesus could have been a Komodo dragon!

  15. Baratos says

    Those Satin’s spawn devil stingrays killed our cartilaginous savior! The end is nigh!

    I figured out that they were evil back when they slew the Prophet Irwin, causing much wailing and gnashing of teeth.

  16. chuko says

    “What’s wrong with leaving a few bite marks?”

    Hey, these ain’t just puny monkey teeth.

  17. Chinchillazilla says

    Komodo dragons, sharks, whiptails… All the cool animals are doing it. How long before humans figure out how to parthenogene…size?

  18. Kseniya says

    Please. Shark teeth were designed for cracking open water chestnuts, not for having sex.

    As for Jesus, the Holy Scriptures make it abundantly clear that hammerheads were involved not at the beginning, but at the end, of his Earthly life.

  19. Caledonian says

    Sharks remind me of the alien species from Alien: a virtually perfect organism, ideally adapted to survive in its environment.

    I doubt ‘perfect’ can be very meaningful when discussing biology, but you’ve gotta admit, sharks are elegantly designed.

  20. says

    Did anyone check on what Troy McClure was doing nine months ago? When he said he spent a couple of days in the tank, I didn’t think he meant…

  21. windy says

    …you’ve gotta admit, sharks are elegantly designed.

    Still, the designer could provide some upgrades now and then. How about an optional swim bladder?

  22. David Marjanović says

    Komodo dragons, sharks, whiptails… All the cool animals are doing it. How long before humans figure out how to parthenogene…size?

    Mammals do some imprinting that makes it impossible. http://news.bbc.co.uk/2/hi/science/nature/3643847.stm

    (No idea if that holds for all mammals, though mice and men are rather closely related.)

  23. David Marjanović says

    Komodo dragons, sharks, whiptails… All the cool animals are doing it. How long before humans figure out how to parthenogene…size?

    Mammals do some imprinting that makes it impossible. http://news.bbc.co.uk/2/hi/science/nature/3643847.stm

    (No idea if that holds for all mammals, though mice and men are rather closely related.)

  24. llewelly says

    I’ll third the Shriekback. I hear that song in my head every time I
    read about hammerheads. Highly recommended. Apropos of nothing, but
    sometime in mid 2001, I played that track, and my younger brother,
    hearing it for probably the first or time in many years, remarked that
    it sounded like a description of the Republican party…
    ‘We are big and clever and we don’t know anything’ …

  25. says

    “From what can be observed, it’s always painful and involves lots of struggling.”

    You say that like it’s a bad thing. Some people are into that, you know. ;)

  26. Graculus says

    Still, the designer could provide some upgrades now and then. How about an optional swim bladder?

    Look, hammerheads already have placenta, next they’ll be wanting warm-blood, like the Great White (and other lamnid sharks).

  27. Nissa Staffaroni says

    LOL… yeah I’m going to University of Nebraska Medical Center grad program right now and I agree with the boyfriend part! I had to bring a guy from Minnesota with me haha! Anyway I hope all is well :)

  28. Renali says

    “You say that like it’s a bad thing. Some people are into that, you know. ;)”

    hahaha! rape is so funny!

    interesting that only men think so, huh.