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Chilobrachys fimbriatus, male or not?

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  • #1

    Chilobrachys fimbriatus, male or not?

    Hi Guys and Gals,

    My Juvie Chilobrachys fimbriatus moulted recently, and I'm convinced it's a male, but I'm not sure if it's 'thin and leggy' look is a result of it just having recently moulted. It is also a lot more active, wandering at night, where as it used to just be a 'pet hole'. Is this pic of any use? Will try and get better ones if I can.



    Thanks, Dave
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    “The attitude of the average person to the world they live in is completely selfish. When I take people round to see my animals, one of the first questions they ask (unless the animal is cute and appealing) is, "what use is it?" by which they mean, "what use is it to them?"...By and large, by asking the question "what use is it?" you are asking the animal to justify its existence without having justified your own.” - Gerald Durrell
    Tags: chilobrachys, fimbriatus, male, male or female
  • #2
    Looks like a male to me.


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    • #3
      Thanks Stephen. So, is he mature? He doesn't appear to have swollen pedipalps, my MM Selenocosmia has 'boxing gloves', nor does he appear to have built a sperm web.
      “The attitude of the average person to the world they live in is completely selfish. When I take people round to see my animals, one of the first questions they ask (unless the animal is cute and appealing) is, "what use is it?" by which they mean, "what use is it to them?"...By and large, by asking the question "what use is it?" you are asking the animal to justify its existence without having justified your own.” - Gerald Durrell

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      • #4
        Unless he has hooks the only 100% way to prove if he is a male is to check the moult

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        • #5
          Unless he's of a genus/species that dont have hooks on maturity Pete, such as Chilobrachys

          I know what you mean though of course.

          Dave,sometimes it can take a while for a freshly mature male to start making a sperm web.You could always move the spider into a clear container and look underneath to view if palpal bulbs are there or not.But really I would say you should be able to see them anyway while the spider is out and moving around.

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          • #6
            When my male matured there were no hooks and his palps were folded back out of view. Most noticable change was his colouration which leads me to think that yours is a male. Some spiders are a bit trickier to sex like this but if you still have a moult you can confirm that way and to be honest it's the only sure way of knowing sex. Good pair of tweezers, Paintbrush to moisten the moult and a magnifier will do the job.

            Originally posted by Dave Shinn View Post
            Thanks Stephen. So, is he mature? He doesn't appear to have swollen pedipalps, my MM Selenocosmia has 'boxing gloves', nor does he appear to have built a sperm web.


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            • #7
              Originally posted by Stephen jordan View Post
              Most noticable change was his colouration
              There is a huge difference in colour now to before the moult, and, it would appear that my 'whinging' has called him out...he has made a sperm web in the last few days, so if anybody needs a male, he's good to go
              “The attitude of the average person to the world they live in is completely selfish. When I take people round to see my animals, one of the first questions they ask (unless the animal is cute and appealing) is, "what use is it?" by which they mean, "what use is it to them?"...By and large, by asking the question "what use is it?" you are asking the animal to justify its existence without having justified your own.” - Gerald Durrell

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