flabellum's Usage Examples:

f, The flabellum or anterior exite.

The latter is further remarkable for having the median area of the head-shield, the flabellum, produced into an anteriorly directed spike.

Fl, The flabellum which becomes the epipodite of higher forms.

In the majority of Trilobites this groove passes backwards from the anterior or anterolateral edge of this plate to its posterior or postero-lateral border, dividing it into an inner portion continuous with the flabellum and fused tergal regions, and an outer portion bearing the eye.