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Oxytropidoceras posted a topic in Fossil NewsLefebvre, B., Guensburg, T.E., Martin, E.L., Mooi, R., Nardin, E., Nohejlova, M., Saleh, F., Kouraïss, K., El Hariri, K. and David, B., 2018. Exceptionally preserved soft parts in fossils from the Lower Ordovician of Morocco clarify stylophoran affinities within basal deuterostomes. Geobios. https://www.researchgate.net/publication/329204055_Exceptionally_preserved_soft_parts_in_fossils_from_the_Lower_Ordovician_of_Morocco_clarify_stylophoran_affinities_within_basal_deuterostomes https://www.researchgate.net/profile/Bertrand_Lefebvre2 Other PDF files of papers are: Fatka, O., Nohejlová, M. and Lefebvre, B., 2018. Lapillocystites BARRANDE is the edrioasteroid Stromatocystites POMPECKJ (Cambrian, Echinodermata). Neues Jahrbuch für Geologie und Paläontologie-Abhandlungen, 289(2), pp.139-148. https://www.researchgate.net/publication/326558585_Lapillocystites_BARRANDE_is_the_edrioasteroid_Stromatocystites_Pompeckj_Cambrian_Echinodermata https://www.researchgate.net/profile/Bertrand_Lefebvre2 Makhlouf, Y., Nedjari, A., Dahoumane, A., Nardin, E., Nohejlová, M. and Lefebvre, B., 2018, November. Palaeobiogeographic implications of the first report of the eocrinoid genus Ascocystites Barrande (Echinodermata, Blastozoa) in the Upper Ordovician of the Ougarta Range (Western Algeria). In Annales de Paléontologie. Elsevier Masson. https://www.researchgate.net/publication/329138078_Palaeobiogeographic_implications_of_the_first_report_of_the_eocrinoid_genus_Ascocystites_Barrande_Echinodermata_Blastozoa_in_the_Upper_Ordovician_of_the_Ougarta_Range_Western_Algeria https://www.researchgate.net/profile/Bertrand_Lefebvre2 Yours, Paul H.
Virgilian posted a topic in Fossil NewsAuthors of a recent paper published in Nature--over at Meiofaunal deuterostomes from the basal Cambrian of Shaanxi (China) by Jian Han, Simon Conway Morris, Qiang Ou, Degan Shu, and Hai Huang --describe the earliest, most primitive deuterostomes, which include of course such major groups as vertebrates, echinoderms, and hemichordates (acorn worms and graptolites). They're from China. They're some 540 million years old, earliest Cambrian in geologic age. They had a mouth, but probably no actual anus. The newly discovered creatures have been named Saccorhytus coronarius gen. et sp. nov., from the Early Cambrian Kuanchuanpu Formation, South China. The authors draw a couple of fascinating conclusions (among others): "In Saccorhytus, however, diffusion across the body surface would have met any respiratory needs, suggesting that a transformation to specifically pharyngeal gills was linked to an increase in body size. If Saccorhytus lacked an anus, body openings may have originated to dispose of waste material."