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Found 6 results

  1. Fossilcollector88

    Insect head in burmese amber

    Insect head in burmese amber Hello all, I found an interesting piece of amber from Myanmar with a large insect head in it, the head is about 5 mm in size. It shows three teeth like serrations, I suspect it to be a wasp. Its a bit degraded but still interesting to me. Anyone have some ideas what it could be?
  2. Being a Colorado native, I have taken multiple trips to the public-access Florissant Fossil Quarry located near Florissant Fossil Beds National Monument in Florissant, Teller County, Colorado. This quarry provides fossil collectors fantastic access to the shale layers of the Florissant Formation, a late Eocene (Priabonian, ~34 million years old give or take) lagerstatte known for its diverse fauna of fossil insects, in addition to plants, gastropods, and very rarely vertebrates. Most fossils occur in very thinly laminated ashy grey shales. Other lithologies present include well-sorted tan course sandstones and well-sorted grey claystones. A lacustrine depositional environment is apparent, and though the Florissant Formation has previously been interpreted as the remains of a single large lake (the retroactively named Lake Florissant), it is now generally thought that deposition occurred across several smaller lakes, which of course shifted in their exact location throughout the period of deposition. This thread is for me to share some of my better quality (or more interesting) fossil insect finds from the Florissant Fossil Quarry, and to allow other people to share their Florissant insects. I intend on updating this thread as I make more collecting trips. Most insect fossils found at Florissant are of poor quality, however exceptionally beautiful specimens do crop up quite frequently. Regardless, identification even down to family level is usually very difficult, and some specimens I even have difficulty assigning to an order. Additional reading: https://bioone.org/journals/palaios/volume-27/issue-7/palo.2011.p11-084r/DEPOSITIONAL-SETTING-AND-FOSSIL-INSECT-PRESERVATION--A-STUDY-OF/10.2110/palo.2011.p11-084r.short Please note that at least for now picture quality is not ideal. I do not have the capacity to take good quality macro photographs, but I am doing the best that I can. The scale of the ruler is millimeters, magnification (when applicable) is noted. Order Diptera (True flies): Probably my best-preserved Florissant insect (and one of the first ones I ever found). Another fly. I'd like to be able to identify this one to family (and it almost certainly is identifiable to family) but I haven't been able to place it. This is a gorgeous fossil! Magnified 20X under a stereo microscope. Another gorgeous fossil fly. Possibly a gnat (suborder Nematocera), but I'm not 100% on this identification. Partial fly of indeterminate family, most of the abdomen is apparently missing. Both wings are preserved, the thorax and head are also nicely detailed. This is an example of a march fly (Family Bibionidae), probably the most common insect at Florissant. Many specimens (such as this one) are preserved without their wings. The head and mouthparts are very nicely preserved here, I feel shameful that I could not manage a better photograph. Crane fly, (Family Tipulidae). The preservation quality is not fantastic, but the gross anatomy can be easily made out (both wings, the abdomen, thorax, head, eyes, and even the halteres and some of the legs are present). Order Hymenoptera (Bees, ants, wasps, and relatives): A nice solitary bee (clade Anthophila). The details are not as high-fidelty as some other Florissant insects, but a nice complete specimen. Order Hemiptera (True bugs): Magnified 20X under a stereo microscope. A shield bug (superfamily Pentatamoidea). This is a really neat specimen because fossil Hemipterans aren't particularly common. Indeterminate Order: A large insect that I've never quite been able to place. Two wings are very faintly preserved which would normally be indicitave of a fly, but this specimen just doesn't look much like a fly otherwise. The antennae are interesting, it's a very large insect, and the tibia has an interesting flange. Unfortunately I can't seem to get a good look at the mouthparts (which has been very useful for me in the past for identification). Magnified 20X under a stereo microscope. At first I thought this might be an ant (family Formicidae) but under magnification the shape of the head is more suggestive of a fly. Very poor preservation, I'm not confident I'll ever get a solid answer here. Larvae: A nice plump fly larva, looks to me to be from a botfly (family Oestridae) or a relative. A very strange fossil. The segmentation and tagmosis definitely means this is an arthropod of some sort, and an insect larva is my current interpretation. Still, I've never seen anything quite like it. I've had a few people suggest to me this might be the abdomen of an earwig, but that's definitely not the case (earwig cerci do not look like this or articulate with the abdomen in this manner). Non-Insect Invertebrates: Just an example of one of the tiny gastropods that are common. It takes a keen eye to see them, but once you can recognize them you realize they're very plentiful. If you have some fossil insects from this locality in your collection, feel free to post them here too! Cheers!
  3. oilshale

    Platyxyela tenuis Zheng et al., 2021

    Taxonomy from Fossilworks.org. Etymology: The specific name tenuis, thin, feminine gender of the Latin, referring to the thinness and delicateness of the body. Diagnosis from Zheng et al. 2021, p. 150: "Forewing long (7.9 mm in length), ovipositor sheath as long as M+Cu and strongly narrowed toward acute apex." Line drawing from Zheng et al. 2021, p. 152: Identified by Prof. A. Rasnitsyn, Russian Academy of Sciences. References: Wang M., Shih C.K. & Ren D. 2012. Platyxyela gen. nov. (Hymenoptera, Xyelidae, Macroxyelinae) from the Middle Jurassic of China. Zootaxa 3456 (1): 82–588. Zheng Y., Hu H., Chen D., Chen J., Zhang H. & Rasnitsyn A.P. 2021. New fossil records of Xyelidae (Hymenoptera) from the Middle Jurassic of Inner Mongolia, China. European Journal of Taxonomy 733: 146–159.
  4. oilshale

    Proterosceliopsis sp.

    Proterosceliopsidae are parasitoid wasps that lay their eggs on or in the bodies of other arthropods, sooner or later causing the death of these. This is a female. Taxonomy according to Fossilworks.org. Diagnosis for the family Proterosceliopsidae according to Talamas et al. 2019, p. 20: “Antenna with 14 or 15 antennomeres; malar sulcus present (Fig. 7); facial striae absent (Fig. 7); malar striae absent (Fig. 7); pronotal cervical sulcus present as a furrow of fine setation associated with glandular excretion (Figs 16, 48–49, 51–53, 59); mesopleuron with transepisternal line and mesepimeral sulcus (Figs 16, 51–53, 59, 63); T3–T5 and S3–S5 anteriorly with depressions associated with glandular excretion (Figs 29, 34, 56, 58, 62).” Several very similar looking species have been described from amber deposits in Myanmar: P. ambulata, P. plurima, P. torquata, P. masneri, P. nigon and P. wingerathi. A more exact assignment is not possible for me. Identified by oilshale as Proterosceliopsis sp. using Talamas et al. 2019. References: Ortega-Blanco J., McKellar R. C,, Engel M. S. (2014): Diverse scelionid wasps in Early Cretaceous amber from Spain (Hymenoptera: Platygastroidea). Bulletin of Geosciences 89: 553–571. https://doi.org/10.3140/bull.geosci.1463 . Talamas, E. J., Johnson, N. F., Shih, C. K., and Ren, D. (2019): Proterosceliopsidae: A new family of Platygastroidea from Cretaceous amber. Journal of Hymenoptera Research. 73:3-38.
  5. Fossilized insect from 100 million years ago is oldest record of primitive bee with pollen, Oregon State University, February 12, 2020 https://www.sciencedaily.com/releases/2020/02/200212164643.htm Fossilized insect from 100 million years ago is oldest record of primitive bee with pollen, Oregon State University https://today.oregonstate.edu/news/fossilized-insect-100-million-years-ago-oldest-record-primitive-bee-pollen The paper is: Poinar Jr, G., 2020. Discoscapidae fam. nov. (Hymenoptera: Apoidea), a new family of stem lineage bees with associated beetle triungulins in mid-Cretaceous Burmese amber. Palaeodiversity, 12(1), pp.1-9. https://bioone.org/journals/Palaeodiversity/volume-12/issue-1/pale.v13.a1/Discoscapidae-fam-nov-Hymenoptera--Apoidea-a-new-family-of/10.18476/pale.v13.a1.full At related open access paper is: Genise, J.F., Bellosi, E.S., Sarzetti, L.C., Krause, J.M., Dinghi, P.A., Sánchez, M.V., Umazano, A.M., Puerta, P., Cantil, L.F. and Jicha, B.R., 2020. 100 Ma sweat bee nests: Early and rapid co-diversification of crown bees and flowering plants. PloS one, 15(1), p.e0227789. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0227789 Yours, Paul H.
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