piranha Posted February 13, 2018 Share Posted February 13, 2018 This is the most recent complete list of trilobites described with appendages. Six trilobites have a complete record of the antennae and post-antennal limbs. table from: Zeng, H., Zhao, F., Yin, Z., & Zhu, M. (2017) Appendages of an Early Cambrian Metadoxidid Trilobite from Yunnan, SW China Support Mandibulate Affinities of Trilobites and Artiopods. Geological Magazine, 154(6):1306-1328 PDF LINK 20 1 Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted February 13, 2018 Share Posted February 13, 2018 And some lovely pictures of some of these, plus other soft part preservation : http://www.pbase.com/hajar/the_whole_trilobite 11 1 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
doushantuo Posted October 25, 2018 Share Posted October 25, 2018 Thanks for that link,Piranha Link to comment Share on other sites More sharing options...
dalmayshun Posted September 5, 2019 Share Posted September 5, 2019 amazing images Link to comment Share on other sites More sharing options...
Arizona Chris Posted June 2, 2020 Share Posted June 2, 2020 Interesting that the latest is only Devonian. I guess there is no carboniferous or permian types? ---------------------------------------------------------------------------------------------------------------------------- Arizona Chris Paleo Web Site: http://schursastrophotography.com/fossiladventures.html Link to comment Share on other sites More sharing options...
Scylla Posted June 7, 2020 Share Posted June 7, 2020 They also do not list egg preservation in the table. Are the Triarthrus the only ones with preserved eggs? Link to comment Share on other sites More sharing options...
piranha Posted June 7, 2020 Author Share Posted June 7, 2020 5 hours ago, Scylla said: They also do not list egg preservation in the table. Are the Triarthrus the only ones with preserved eggs? Why would they list eggs in that table? The list is from a paper on trilobite appendages ... not eggs! Here are the two most recent papers on possible trilobite eggs: Bernardez, E., Esteve, J., Laibl, L., Rábano, I., Gutiérrez-Marco, J.C. 2019 Early Postembryonic Trilobite Stages and Possible Eggs from the ‘Tunel Ordovıcico del Fabar’ (Middle Ordovician, Northwestern Spain). Fossils and Strata, 64:23-33 PDF LINK Hegna, T.A., Martin, M.J., Darroch, S.A.F. 2017 Pyritized in situ Trilobite Eggs from the Ordovician of New York (Lorraine Group): Implications for Trilobite Reproductive Biology. Geology, 45(3):199:202 PDF LINK 3 Link to comment Share on other sites More sharing options...
Scylla Posted June 8, 2020 Share Posted June 8, 2020 10 hours ago, piranha said: Why would they list eggs in that table? The list is from a paper on trilobite appendages ... not eggs! I thought it was about soft tissue preservation in trilobites. Mentioning eggs would make perfect sense when discussing soft tissue preservation Link to comment Share on other sites More sharing options...
piranha Posted June 8, 2020 Author Share Posted June 8, 2020 1 hour ago, Scylla said: I thought it was about soft tissue preservation in trilobites. Mentioning eggs would make perfect sense when discussing soft tissue preservation Sorry ... but eggs do not make 'perfect sense' as they are completely unrelated to the primary subject of the paper: Abstract – Appendage anatomy contributes crucial data for understanding the evolution and ecology of Euarthropoda. The Palaeozoic trilobites show a great diversity of exoskeletons in the fossil record. However, soft parts, especially appendages, have only been discovered from a few trilobite species. Here we report extraordinarily preserved appendages in the trilobite species Hongshiyanaspis yiliangensis Zhang & Lin in Zhang et al. 1980 (Redlichiida, Metadoxididae) from a single mudstone layer of the Xiazhuang fossil assemblage within the Hongjingshao Formation (Cambrian Series 2, Stage 3) near Kunming, Yunnan, SW China. The appendages exhibit the common architecture revealed by other trilobites and artiopods by consisting of a pair of uniramous antennae followed by a series of paired homonomous biramous limbs. The antennae in holaspid individuals comprise up to 27 spinous podomeres and their ontogeny occurs by lengthening of the podomeres. The post-antennal biramous limbs are similar to those in other polymerid trilobites and artiopods by having a single-segmented protopodite and an endopodite comprising seven segments, but possess a unique wide tripartite exopodite with long setae. Sophisticated appendage anatomy, including the body–limb junction, fine setae, putative muscle bundles and duct-type tissues, are also revealed. Appendages of trilobites, artiopods and other upper stem-group euarthropods are compared and summarized. The H. yiliangensis appendages highlight the high morphological disparity of exopodites and the conservativeness of endopodites in trilobites and artiopods. This morphological pattern, together with similar body patterning seen in crustaceans but not in chelicerates, supports the mandibulate affinities of trilobites and at least some artiopods. 1 Link to comment Share on other sites More sharing options...
Scylla Posted June 9, 2020 Share Posted June 9, 2020 On 6/7/2020 at 11:24 PM, Scylla said: I thought it was about soft tissue preservation in trilobites. Mentioning eggs would make perfect sense when discussing soft tissue preservation Mentioning eggs would make perfect sense WHEN discussing soft tissue preservation. Obviously I would not expect a paper on appendages to discuss eggs. I did not understand that the paper was about appendages since all I had seen was the table. I was trying to explain that with the above posting. Link to comment Share on other sites More sharing options...
JohnJ Posted June 9, 2020 Share Posted June 9, 2020 Gentlemen, a misunderstanding has been 'eggsplained'. We can all 'get a leg up' on trilobite knowledge using the latest links provided by @piranha. 3 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
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