noun (plural pygidia /-ˈjidēə/)Zoology
The terminal part or hind segment of the body in certain invertebrates.
- The pygidium, like the cephalon, was a structure in which segments were fused together.
- A pygidium with an attached thoracic segment represents a meraspid stage of the species.
- By contrast, some representatives of the Olenelloidea have pygidia with multiple segments.
Mid 19th century: modern Latin, from Greek pugē 'rump'.
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