[Copepoda] maxillule;
Le1: coxal epipodite - first external lobe
Le2: basal exite - second external lobe
Li1: praecoxal arthrite - first internal lobe
Li2: coxal endite - second internal lobe
Li3: basal endite - third internal lobe
Li4: basal endite - fourth internal lobe.

(Fig. Co.1f , Mx1 maxillule)

Alternative form for Mx1 : Mx 1.