Frontal margin

Nomenclature of isopod cephalon (A). Examples of isopod mouth appendages: Idoteidae (B, C, F, H); Cirolanidae (D, E, G, I).

From: Wetzer, R., Brusca, R. C., Wilson, G. D. F. 1997. Crustacea, Isopoda. Descriptions of species of the suborders Anthuridea, Epicaridea, Flabellifera, Gnathiidea, and Valvifera. In: Blake, J.A., Scott, P.H. (ed.) The Crustacea Part 2. The Isopoda, Cumacea and Tanaiacea [Taxonomic Atlas of Santa Maria Basin and Western Santa Barbara Channel, California] Santa Barbara, California: Santa Barbara Museum of Natural History 11:5-58..

This image is referenced by the following definitions:

Aesthetascs	[Wetzer et al. 1997]
Antenna	[Wetzer et al. 1997]
Antennule	[Wetzer et al. 1997]
Basis	[Wetzer et al. 1997]
Cephalon	[Wetzer et al. 1997]
Clypeus	[Wetzer et al. 1997]
Coupling spine	[Wetzer et al. 1997]
Coxa	[Wetzer et al. 1997]
Endite	[Wetzer et al. 1997]
Epipod	[Wetzer et al. 1997]
Frontal lamina	[Wetzer et al. 1997]
Frontal margin	[Wetzer et al. 1997]
Incisor process	[Wetzer et al. 1997]
Labrum	[Wetzer et al. 1997]
Mandible	[Wetzer et al. 1997]
Maxilla	[Wetzer et al. 1997]
Maxilliped	[Wetzer et al. 1997]
Maxillule	[Wetzer et al. 1997]
Molar process	[Wetzer et al. 1997]
Palp	[Wetzer et al. 1997]
Spine row	[Wetzer et al. 1997]