Cephalic biomechanics underpins the evolutionary success of trilobites

Jorge Esteve, Jordi Marcé-Nogué, Francesc Pérez-Peris & Emily Rayfield
Arthropods (i.e. insects, spiders, crustaceans, myriapods and others), are the most successful Phanerozoic animals. The group are characterised by the possession of a segmented body, jointed limbs and a hard cuticle that is episodically moulted. One highly successful, but now extinct, group of arthropods are the trilobites. Trilobites underwent episodic moulting (ecdysis), and most trilobites possess facial sutures, lines of weakness in the cephalon, via which the exuviae is shed and the animal emerges. However,...
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