A new nektaspid euarthropod from the Lower Ordovician strata of Morocco
作者： Francesc Pérez-Peris , Lukáš Laibl , Lorenzo Lustri , Pierre Gueriau , Jonathan B Antcliffe
DOI: 10.1017/S001675682000062X
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摘要: Nektaspids are Palaeozoic non-biomineralized euarthropods that were at the peak of their diversity during Cambrian Period. Post-Cambrian nektaspids a low-diversity group with only few species described so far. Here we describe Tariccoia tazagurtensis, new small-bodied nektaspid from Lower Ordovician Fezouata Shale Morocco. The differs type (and other known) strata Sardinia (Italy), arrusensis, in possessing more pointed genal angles, cephalon marginal rim, pygidium anterior margin curved forwards, rounded posterior margin, and longer thoracic tergites. two specimens T. tazagurtensis sp. nov. show remains digestive glands comparable to those seen Naraoia. rare occurrence distribution liwiids suggest these originally minor members open-marine communities Period, migrated into colder brackish or restricted seas
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