ARCHIVED: Metacanthina Maderensis Trilobite In Acrylic Lidded Case 76mmA superb example of a Metacanthina maderensis trilobite measuring 76mm. Now excavated from the heart of Morocco's Devonian landscape that dates some 411,000,000 years. Metacanthina maderensis Moroccan trilobite. The glabella (head shield) with robust genal spines, the thorax with thoracic segments clearly defined, and the pygidium (tail) displaying the frilly skirt typical of this type, all sections and components are in an excellent preserved state