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About JKim

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    Louisiana, USA
  • Interests
    Scarab Taxonomy

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  1. To provide an explanation what I replied to this original quthor: One of the definition for biological species is an ability to continuously breed, which means, it has to be fertile throughout the generations. There are some words that Dynastes grantii and D. tityus can hybridize, but there is only one generation comes out of it, no officially known F2 specimens exist. Only hybridization data available is from U of Kentucky, but they got males only for the F1 Hybrids, and there is no further records about it. Sister species are close to each other, so they may be able to mate and breed for only one generation because that hybrid generation is lacking fertility. There were some ads for dried specimens of [ D. hercules X D. hyllus ] and [ D. hercules X D. grantii ] couple times a while ago in Japanese auctions, but that is very rare case, and never heard of any further generations occurred. Ultimately, back to the original question: Is it possible to mate? yes, the copulation can occur, but genitalia may not perfectly fit in. To have a perfect and proper copulation to occur, a male genitalia must be properly inserted into a female genitalia. Genitalia of male and female of same species work like a key to a lock. (which is why morphological characteristic of genitalia can be a great key to identify species) Even if the copulation occurs, their genes are differ, and may not properly fertilize. And also, as I mentioned above, the hybrid generations are not fertile to produce next generations. (they sometime don't even have a genitalia to copulate).
  2. For everyone who already has read this article, and wonders about what happened afterward: Unfortunately, according to UKY ento dept. personnel, there has been no update to this article (and the study) because the one who conducted this study is no longer affiliated to UKY, and the department has no contact info whatsoever of the person (which sounds weird). They have no clue whether the hybrid F1 was fertile and had an ability to breed any further generations. I contacted UKY personnel to know the further updates while I was working on a manuscript, to be published, of the occurrence of Dynastes tityus (L.) in Louisiana.
  3. I noticed his nickname is Korean name, so I just wrote in Korean language...
  4. @junseong.jang 아직 미국에 계신가요? 생물학적으로 종(species)의 정의는 계속해서 브리딩이 가능한, 즉 생식기능이 이어져가는 것을 종으로 봅니다. 미국 남서부에 있는 그란티와 동남부에 있는 티티우스가 교잡이 가능하다는 얘기가 있긴 한데 하이브리드 1세대만 나오지, 그 이후 세대까지 나온다는 기록은 아직까진 못봤습니다. 유일하게 제대로 기록된 곳의 자료가 U of Kentucky 대학의 곤충학 연구실인데, 교잡으로 나온 1세대 개체들은 모두 수컷으로 나왔다고 합니다. 그 이후 기록은 없다고 함... 자매종(sister species)의 경우 그만큼 가깝기 때문에 한 세대(generation) 정도의 번식만 겨우 가능합니다. 하지만 생식 기능이 떨어져 추가 세대는 나오지 못하는게 일반적입니다. 과거에 헤라클레스x힐루스, 헤라클레스x그란티 등의 교잡 개체가 일본 옥션에 몇차례 뜬 적 있었지만 굉장히 희귀한 케이스고, 그 다음 세대가 있단 얘기는 못들어봤습니다. ultimately, ... 짝짓기(copulation)가 가능하냐는 질문을 하셨는데... 짝짓기가 정상적으로 이루어지려면 수컷의 생식기가 암컷의 생식기에 열쇠와 자물쇠처럼 정확하게 일치하여야하는데 종이 다르다면 형태가 달라 올바르게 연결이 되지는 못합니다. 억지로 연결이 되더라도 말씀드렸다싶히 정상적이지 못하고 생식기능이 떨어지기 때문에 다음 세대가 나오더라도 다수 사망에 이르고, 생식기능 없이 우화하는 경우가 많습니다.
  5. JKim

    Carnivorous Plants

    Yes, you are right. I was wrong about the soil part.. I only knew that they don't consume bugs trapped as the main source of nutrition, and since I was aware they require full sunlight, I thought sunlight AND SOIL is what they mainly absorb nutrition from. I found this out far later, couple months ago, when I found some Drosera brevifolia on my backyard. They were growing on sand, so I noticed they barely get any nutrition from soil.
  6. @BeetleShelf Both Importation and exportation require permits, generally speaking. You will need a permit to have species exiting out from the U.S., and a separate permit to have species entering into the destination country. Also, even if it is legal to import alive animal in some countries, it may highly vary per species, per original location, how things are packaged, what comes along (soil, wood, whatever) with the target species, etc., etc... Things are quite complicate, and if you REALLY want to know for sure (so you can actually do it), you must contact USDA/FWS so you can get their names and/or their "official letters," so just in case you are in trouble you can provide the "evidence." USDA and FWS are two different agency, telling two different answers to a single question. One may say "yes," while the other one may say "no." If any of them said "no," then it is eventually "NO." FWS in DFW airport has different aspects from FWS in IAH airport. (FYI, agents in those two locations cannot even identify scarabs/birdwings.) So be sure to contact someone in USDA/FWS and get official letters provided to your name.
  7. Here I'm attaching a female pupa of Lucanus placidus I reared from an egg. I collected an adult female some time ago, and got some eggs from her.
  8. JKim

    Sexing Gymnetis thula (caseyi)

    I don't think your picture is attached properly (check the size of file). Variation, or a phenotype, can be presented all kinds of animals and plants that reproduces by a copulation between a male and a female. Anything that goes through parthenogenesis or cloning won't show a difference from a parent to offsprings. Gymnetis thula has many different variations recorded in scientific publication: black with yellow markings, half and half of black and yellow, mostly yellow, entirely yellow, reddish brown with yellow, etc....
  9. JKim

    Sexing Gymnetis thula (caseyi)

    Look at abdomen and see if there is any vertical groove on the middle of it for adults. If there is one, that is a male, and if not, female. In case of larvae, a small dot on abdomen near anus is present for males, while not for females. This, however, may be tricky (confusing) for small cetoniine species like Gymnetis.
  10. JKim

    Geotrupes sp. in captivity?

    Good info from an expert + experienced person. I used my own for dung beetle trapping an year ago, and I was able to collect roughly over 200 Geotrupes blackburnii excrementi, as well as many different dung beetles and other Geotrupid species. I never tried to breed them though. Maybe I should try this year if I can acquire horse or cow manure. The reason not using human or dog must be the "smell." Since horse or cow only feed on plant materials, makes their feces not too smelly, but humans (or dogs) consume all kinds (meat+veggie), makes the feces smelly... I never really thought of using my own for breeding indoor, maybe in backyard, far from my house (building).. If the project fails to breed, then I was thinking about dumping the entire plastic container away...haha
  11. JKim

    Pelidnota punctata

    the grapevines where I mostly collect these beetles were definitely different species from the harvested on in my backyard long time ago. But that didn't matter. I fed captured adults with the one at my backyard. So, probably, no, it does not matter.
  12. JKim

    Pelidnota punctata

    One tip I can give you is to light up (if you are doing light trapping) at the forest where it actually has grapevines. There is no other reason why they are called as "Grapevine beetles." They love feeding on grapevine.
  13. JKim

    Checking on my stag

    He is upside down to dry a ventral side of abdomen (belly). No worry, as long as he is inside the pupal cell, and not out in plain ground. If he is inside the pupal cell, he will be able to grab a wall and lift himself up. Try not to touch for next couple days. L. elaphus is not known to die out of shock like some exotic species, though it is best to keep it alone for a week or two since they emerged out of pupa.
  14. JKim

    Pelidnota punctata

    Yes, these are F2 larvae. I collected a pair two years ago, and bred some larvae. They became adult beetles, and laid another batch of eggs. AND I actually collected a handful this year, so I added couple alive ones in the same container.. So I'm guessing they are all mixed up. I just looked up on BugGuide, and most recent records indicate P. punctata in New York are mostly active in July to August. In Louisiana, P. punctata are found in May to early July for the most, and still be found couple latter months.
  15. JKim

    Pelidnota punctata

    An image of L1-L2 larvae of Pelidnota punctata