pygidium

/pahy-jid-ee-uhm/US // paɪˈdʒɪd i əm //UK // (paɪˈdʒɪdɪəm, -ˈɡɪd-) //

梨状体,梨状物,梨状细胞,梨形体

Definitions

n.名词 noun

1
plural py·gid·i·a [pahy-jid-ee-uh]. /paɪˈdʒɪd i ə/. Zoology.
- : any of various structures or regions at the caudal end of the body in certain invertebrates.

All indications are that the spine was not in any sense a pygidium.
It and the pygidium are due solely to functional requirements.
Pygidium and part of the thorax, with some of the appendages.
Appendages of the thorax and pygidium, seen from the dorsal side.
This same type of broad-bladed exopodite is also found on the thorax and pygidium.