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One head with two bodies the Onaraspis-Myopsolenites trilobite conundrum

AuthorsÁlvaro-Blasco, José Javier ; Esteve, Jorge; Gracia, F.; Zamora, Samuel
Issue Date14-Dec-2016
Citation60th Annual Meeting of the Palaeontological Association (2016)
AbstractA new fossil assemblage of Cambrian Epoch 2 (early Cambrian) redlichiid trilobites has been found in the Huérmeda Formation of the Iberian Chains, northeast Spain. This assemblage is dominated by complete specimens characterised by macropleura-bearing thoraxes close to the genera Onaraspis Öpik, 1968 and Myopsolenites Geyer and Landing, 2004, the former reported from Australia and the latter from the Mediterranean and Polish margins of Gondwana. Despite their cephalic similarities, these taxa display highly diversified thoraxes and shield-like pygidia. Although the number of segments in the trunk and the proportions allocated to the thorax and pygidium varied with ontogeny, several Iberian genera and species can be taxonomically differentiated based on trunk features. Cambrian diversification not only featured evolutionary ‘experiments’ with the constructional framework for the trilobite cephalon, but also for the trilobite trunk. The Cambrian diversification in the development of the trunk represents a wakeup call for taxonomic analyses exclusively based on disarticulated cranidia, and highly controlled by taphonomic biases.
DescriptionTrabajo presentado en el 60th Annual Meeting of the Palaeontological Association, celebrado en Lyon (Francia), del 14 al 17 de diciembre de 2016
Appears in Collections:(IGEO) Comunicaciones congresos
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