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About Goliathus

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  • Birthday 02/27/1973

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

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  1. 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?
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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
  7. 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.
  8. 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
  9. 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.
  10. 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).
  11. Goliathus

    Unidentified Larva

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

    Unidentified Larva

    Most likely either a melolonthine ("June" beetle) or ruteline (Shining leaf chafer) larva - only way to know for sure would be to raise it to adult. I suspect that it's probably the larva of a melolonthine.
  13. Goliathus

    Osmoderma advice?

    I reared Osmoderma eremicola for several consecutive generations. Larvae generally only took a year to go from egg to adult (under temperature-controlled conditions), and adults could live for several months. Despite temperature control, a percentage of larvae would diapause in "psuedo cocoons" through the winter, at the end of stage L2.
  14. It's the larva of a cetoniine scarab of some kind - possibly Osmoderma eremicola.
  15. Goliathus

    Beetle Wish List

    Yes - Eupholus weevils look (and move) like tiny, hand-painted robots! Here's another very neat weevil - Macrochirus praetor (Giant Malaysian Palm Weevil), which is the largest curculionid in the world, at over 90 mm. Males have enlarged, hook-like front legs, and spiny projections on the snout. The dorsal surface has a velvet-like texture similar to that of many cetoniine scarabs, and the ventral side is very glossy black.