[Copepoda] Abbr. for internal lobe or endite of maxullule (Mx1), maxilla (Mx2), and maxilliped (Mxp).

(Fig. Co.1f , Mx1 maxillule)
(Fig. Co.1g , Mx2 maxilla)
(Fig. Co.1e , Mxp maxilliped)

Alternative form for Li : endite.