cedariiform adjective1 •Of the facial sutures of a trilobite, having a pattern in which the posterior sutures cross the lateral border, then swing inward and backward to meet the posterior margin.[…] [T]he shape of the occipital ring, the small number of thoracic segments, and the pygidial morphology, as well as the cedariiform suture - are not known in any proetid. — 1977
