Definition of pygidium in English:
noun (plural pygidia /pʌɪˈdʒɪdɪə, pʌɪˈɡɪdɪə/)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.
Definition of pygidium in:
- US English dictionary
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