Pygidium in trilobite if larger than cephalon is called
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✏️ The pygidium is the posterior body part or shield of Crustaceans and some other arthropods , such as insects and the extinct trilobites.
✏️ In trilobites , the pygidium can range from extremely small (much smaller than the head or cephalon) to larger than the cephalon.
✔️ If pygidium is equal to cephalon is subisopygous.
✔️ If pygidium larger than cephalon is called macropygous.
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