pygidium

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pygidium

(pī-jĭd′ē-əm)
n. pl. pygid·ia (-ē-ə)
The posterior body region or segment of certain invertebrates.

py·gid′i·al (-ē-əl) adj.
References in periodicals archive ?
Three cranidia (NIGP152242, 152244, 152247) and three pygidia, (NIGP152243, 152245, 152246) from level BS6, Section 1; two cranidia (NIGP152250, 152251) and one pygidium (NIGP152249) from level BT4, Section 2.
Their overall morphology is similar to the cranidia illustrated here, but the poor quality of the material and illustration and the lack of illustrations of pygidia make the identification of our material uncertain.
Pygidia are necessary for reliable identification (e.
The described cephala, occurring stratigraphically close to the pygidia of morph A, are here considered to belong to a separate morph, but further studies may prove that they belong together.
The pygidia have pleurae with anterior bands slightly narrower than posterior bands, pleural and interpleural furrows of nearly equal width and depth, which run nearly straight parallel to each other and reach rather close to the border, being not deeply incised.