to the cephalon.

* Micropygous - the pygidium is considerably smaller than the cephalon.
* Subisopygous - the pygidium is slightly smaller than the cephalon.
* Isopygous - the cephalon and the pygidium are more or less of equal size.
* Macropygous - the pygidium is larger than the cephalon.

They can further be subdivided in their morphological similarity to the thorax. Pygidia that are similar in shape and form to the thoracic segments are termed homonomous,

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