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Setae growth

Discussion in 'Tarantula Questions & Discussions' started by StampFan, Jan 13, 2018.

  1. StampFan

    StampFan Arachnosquire Active Member

    Can setae (any setae, not just urticating) grow between molts or do they only grow with a new exoskeleton after a molt?

    Can't seem to find the answer.

    I swear it looks like my one Pamphobeteus has grown setae on its legs since the molt but want the scientific answer not another opinion.

    Thank you in advance.
  2. Sarkhan42

    Sarkhan42 Arachnobaron Active Member

    Only after a molt, setae are formed with the exoskeleton, they don't grow like mammal hair does, in fact they're completely different in composition and in development.
    • Agree Agree x 3
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  3. Venom1080

    Venom1080 Arachnoking Active Member

    Setae may not obvious after a molt when the spiders fresh.

    @AphonopelmaTX probably knows more.
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  4. Sarkhan42

    Sarkhan42 Arachnobaron Active Member

    • Helpful Helpful x 1
  5. StampFan

    StampFan Arachnosquire Active Member

    Old is relative young man lol.

    Leave it to Stan Schultz to provide a definitive and finite plethora of info in his answer. Somebody please give that guy a direct wifi line and Word in his RV so he can complete his revision of The Book.
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  6. AphonopelmaTX

    AphonopelmaTX Moderator Staff Member

    Pretty much what @Sarkhan42 said. New setae is formed underneath the old (or current) exoskeleton of a spider when the new cuticle layers that make up the exoskeleton are so it doesn't grow after a spider completes its molt (ecdysis). The original question can be answered "yes" and "no." It forms between molts while the new exoskeleton is forming, but not after the spider molts. When a spider pulls itself out of the old exoskeleton it has all the setae it will have for that period between molts (instar) assuming none is rubbed off. During the course of raising a spiderling, one will see that new setae is present in greater number or density and in more locations on the body as it completes each molt.
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