Ogygopsis was a medium-size trilobite, and was more highly evolved than its early Cambrian ancestors.
The body was fairly wide, and although the cephalon (head end) lackedthecomplexity or ornamentation of other forms, Ogygopsis did have long genal spines projecting from the 'cheeks' or edges of its cephalon.
These genal spines reached to about the middle of the thorax.
The tail, or pygidium, was larger than in most other Cambrian trilobites, consisting of multiple thoracic segments fused together to form a single large plate.
When the pygidium is almost as large as the cephalon, such as in Ogygopsis, this is known as an isopygous type of trilobite.
However, loss of segments ro the tail meant that there were only eight segments in the thorax.
Ogygopsis was a medium-size trilobite, and was more highly evolved than its early Cambrian ancestors. The body was fairly wide, and although the cephalon (head end) lackedthecomplexity or ornamentation of other forms, Ogygopsis did have long genal spines projecting from the 'cheeks' or edges of its cephalon. These genal spines reached to about the middle of the thorax. The tail, or pygidium, was larger than in most other Cambrian trilobites, consisting of multiple thoracic segments fused together to form a single large plate. When the pygidium is almost as large as the cephalon, such as in Ogygopsis, this is known as an isopygous type of trilobite. However, loss of segments ro the tail meant that there were only eight segments in the thorax.
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