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Trilobites are an extinct group of marine arthropods that flourished during the Paleozoic Era, particularly from the Early Cambrian to the end of the Permian period. Their morphology is distinctive and highly significant in stratigraphy and palaeontology due to their widespread occurrence, rapid evolution, and varied forms, making them excellent index fossils. Trilobites exhibit a segmented body plan divided into three main parts: the cephalon (head), thorax (body), and pygidium (tail). The cephalon typically bears compound eyes, glabella, and facial sutures, which are ____ _______ __________ _______ __________.
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