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Goliathus

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About Goliathus

  • Rank
    Pupa
  • Birthday 02/27/1973

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  • Gender
    Male
  • Location
    The Living Planet
  • Interests
    Coleoptera (esp. Scarabaeidae, Lucanidae, Cerambycidae, Buprestidae & Curculionidae)

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  1. ...I would have severe concerns about the safety of heating even wet sawdust to 240F using any commonly available method for any considerable length of time. Seconded! My advice - stick to time-tested fermentation methods that are known to work well and safely. Incidentally, wood can start to char at as little as 180 C. I'm sure that wetness vs. dryness is a factor, but even if the material is wet when the heating process starts, it might not uniformly remain wet enough to prevent the possibility of ignition. And, it's not just the potential for fire that's a threat - carbon monoxide can be produced too, if combustion starts.
  2. Goliathus

    Gymnetis thula Adult Lifespan

    That's great - congratulations!
  3. Goliathus

    Gymnetis thula Adult Lifespan

    Yes, that should be perfect.
  4. Goliathus

    Gymnetis thula Adult Lifespan

    I've had thula adults live for at least 8 months, and they can remain fertile for quite a long time. In the 15 or so years that I've been keeping this species, I don't think I've ever actually seen a single mating! Obviously though, it must happen, as you just keep the beetles together on a suitable breeding substrate, and after a while (usually less than a month) you'll suddenly start to see tiny larvae appearing. Several weeks after that, there can be hundreds! If your substrate is of good nutritional quality, they'll grow quite fast. The larvae also like apple slices, though they might not take much interest in it until they get into the late L2 stage.
  5. Goliathus

    Goliath beetles

    I assume that the container with the cocoon must be ventilated somehow? I can't tell from the photo, but undoubtedly, there are some ventilation holes? Is the cocoon normally kept on the substrate surface like that, throughout the pupation process?
  6. I am in agreement with all of these comments. Yes, it's quite possible that granti and tityus diverged considerably less than 2 mya. They might not have appeared as distinct "species" until sometime well into the Pleistocene, possibly even the latter part of the epoch.
  7. At the genus level, there won't be very much genetic difference between two species, even if their physical characteristics are quite different. D. granti and D. tityus are very closely related, and by some classifications, they may simply be viewed as geographical races of the same species. They possibly diverged from a common ancestor when increased aridity in the southwest geographically separated the AZ / NM mountains from the wetter environments of the east.
  8. I believe that the "2 million years" quote is based upon research on a variety of species, (esp. mammals) though it might not necessarily apply to all animal groups (inc. insects), and probably not to plants at all. Of course, through genetic engineering, it's possible to mix genes from species separated by hundreds of millions of years (e.g. cats and jellyfish). Undoubtedly, we'll be seeing a LOT more of this in the years to come.
  9. I've never produced any Dynastes hybrids myself, although I've often had the opportunity to mix tityus and granti. Many hobbyists are against producing hybrids, for fear of contaminating pure species bloodlines. If hybrids are produced, one should definitely take care to keep them separated from any pure species lines.
  10. I'm wondering if anyone has ever hybridized these Hercules beetles (or, frankly any other living thing) Yes - hybrids have been produced between tityus & granti, hyllus & hercules, and (possibly) hyllus and granti. I'm wondering if the hybrids were viable or sterile, and how many generations. Fertility results from hybrids are variable. So long as two species are not separated by any more than about 2 million years of speciation, they should (theoretically) be able to hybridize. However, whether or not the hybrids are fertile varies, and likely depends upon just how much genetic drift has occurred between the two species involved. Of course, in the case of some insects such as beetles, the form of the reproductive organs between even species that are in the same genus can be different enough that successful mating between the two is unlikely to occur. I saw online that in a large group of hybrid females only one laid eggs making a second generation of hybrids. I have no further info on how the second generation did. Yes - I assume you are talking about the following web page? - http://www.uky.edu/Ag/CritterFiles/casefile/insects/beetles/hercules/hybrids.htm
  11. Goliathus

    Gymnetis caseyi - new species name

    That specimen shown on BugGuide is an unusual colour variant from the far southern tip of TX (Brownsville). Whether this variant turns up regularly in that area, or if this specimen is rather unique, I have no idea.
  12. I've just been informed that Gymnetis caseyi has recently been re-named Gymnetis thula (Ratcliffe, 2018): http://texasento.net/caseyi.htm https://bugguide.net/node/view/68158 By the way, has anyone here ever seen a thula quite like this one? - https://bugguide.net/node/view/736046
  13. Goliathus

    My First Scarab Pupae!

    Holy crap that's a vibrant yellow! The one I can see is definitely more of a dark grey right now. Not sure if that's because it's teneral or just humidity. It's the humidity. As soon as the beetle emerges from the cocoon and dries out a bit, the yellow will appear. If kept under high humidity all the time however, they will remain dark. About how long do they stay dormant after eclosing? Not sure, since I've always left them undisturbed in their cocoons, but the wait time between eclosion and emergence must be rather short, since the entire duration of the cocoon stage, from construction to emergence, doesn't take very long (maybe 6 weeks or less). G. caseyi is definitely one of the best US flower beetles to have - large, colorful, and extremely easy to maintain.
  14. Goliathus

    My First Scarab Pupae!

    Here's a photo of some caseyi that I had emerge this morning, shown next to a quarter to give an idea of size. This species is a great favorite of mine - have been keeping it for many years. In the American tropics and subtropics, Gymnetis essentially fills the same ecological niche as the genus Pachnoda does in Africa. Of course, they belong to different tribes of Cetoniinae - Gymnetis (Gymnetini), Pachnoda (Cetoniini).
  15. Goliathus

    Unidentified Larva

    It's the larva of a cetoniine scarab of some kind - possibly Osmoderma eremicola or O. scabra.
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