frontal lamina

(Order Isopoda):

A sternal plate arising between the bases of the antennae and probably homologous to the epistome of their arthropods; in many isopods the frontal lamina may extend anteriorly to be visible in the dorsal aspect; in many Valvifera the upper and lower regions of this structure may be separately elevated and visible in the dorsal aspect as two distinct structure (frontal lamina 1 and frontal lamina 2) [Wetzer et al. 1997].

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^{Schematic representation of an isopod illustrating morphological terms. [Kensley and Schotte, 1989]}

(Order Isopoda):

Plate-like structure anterior to mouth-parts, usually situated between antennae, (pentagonal, quadrate, spiniform, triangular) [Stachowitsch, 1992].

(Order Isopoda):

Platelike structure of the cephalon immediately anterior to, and sometimes fused with, clypeus [Kensley and Schotte, 1989].

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^{Nomenclature of isopod cephalon (A). Examples of isopod mouth appendages: Idoteidae (B, C, F, H); Cirolanidae (D, E, G, I). [Wetzer et al. 1997]}