pygidium

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pygidium

[pī′jid·ē·əm]
(invertebrate zoology)
A caudal shield on the abdomen of some Arthropoda.
The terminal body segment of many invertebrates.
References in periodicals archive ?
the number of pleural segments and length/width ratios of the axis or cephala and pygidia in general; Nielsen 1995).
A few pygidia of Asaphellus from the Psilocephalina lubrica Association differ from those of Asaphellus inflatus in having a more transverse outline of the pygidium, which is almost half as long as wide, more strongly impressed axial pygidial furrows and a more distinct pygidial border.
Three cephala (NIGP152225, 152226, 152229) and three pygidia [XIGM Tr017 (Fig.
Distinct median axial tubercles have also been described in pygidia of S.
However, the course of the furrows and the relation of the bands of pleura may be a visual effect related to the width of lateral lobes (in wider pygidia the parallel-sided area of pleural bands becomes accordingly more extended).