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KTENOURA

KTENOURA This trilobite has an elongate external skeleton, with a thorax made up of 11 segments. Facial sutures are of the proparian type, cutting into the side margin of the head. The cheeks and pleurae are narrow, with the eyes situated anteriorly and close to the glabella. The glabella itself is convex, expanding gently forward in width. The complex boss-and-socket articulation between segments enabled it to roll up tightly. It has a moderate-size tail shield, with three pairs of long marginal spines which curve backward. Habitat: This trilobite was a typical inhabitant of shelf seas. © 1992 Cyril Walker, David Ward .