Calymene

Silurian-Devonian

This is the trilobite most figured in this chapter. It is a small species, typically 2 cm in length. The cephalon is the widest part of the animal, and the thorax typically has 13 segments. The species was capable of complete enrollment, and is commonly preserved in this attitude. The fixed hypostome suggests that Calymene was predatory.

Cyclopyge

Ordovician

A large-eyed trilobite with a streamlined thorax and pygidium. The species was small, typically 4 cm in length, and is usually found in black shales. It had a wide geographic distribution. The features of this species are typical of pelagic trilobites, active swimmers who needed good all-round vision, including a view downwards.

Phillipsia

Lower Carboniferous

Another small trilobite, 2-4 cm in length. This trilobite had an oval shape, with a cephalon and pygidium of about the same size. The thorax between has nine segments. This is a member of an extremely long-lived and morphologically conservative group of trilobites, the proetids, that were amongst the last survivors of the group.

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