Definitions

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Clypeus

An unpaired dorsal unit of the cephalon bearing the labrum medially and the mandibular fossae laterally. The fossae articulate with the dorsal condyle of the mandibles. [Wilson, 1989]
Part of head carrying labrum; plate on anterior medial part of head formed by fusion of basal segments of antennae (e.g., Branchipus, also Hexapoda). [Moore and McCormick, 1969]
(Taxon-specific: Order Anostraca) Part of cephalon carrying labrum; plate anteromedially on head formed by fusion of basal segments of antennae. [McLaughlin, 1980]
(Taxon-specific: Order Anostraca) Plate-like structure fromed by medial fusion of bases of antennae. (with/without digiform process).
(syn. frontal plate) [Stachowitsch, 1992]
(Taxon-specific: Order Tanaidacea) On underside of head, plate-like structure bearing upper lip (labrum). Separated from labrum by suture. [Stachowitsch, 1992]
Nomenclature of isopod cephalon (A). Examples of isopod mouth appendages: Idoteidae (B, C, F, H); Cirolanidae (D, E, G, I). [Wetzer et al. 1997]
(Taxon-specific: Order Isopoda) In most (but not all) isopods the labrum consists of two pieces; the anteriormost (proximal) piece is referred to as the clypeus, the posteriormost (distal) piece as the labrum proper. [Wetzer et al. 1997]
(Taxon-specific: Order Isopoda) Part of head (cephalon) bearing upper lip (labrum). [Stachowitsch, 1992]
Schematic representation of an isopod illustrating morphological terms. [Kensley and Schotte, 1989]
(Taxon-specific: Order Isopoda) Platelike structure of cephalon, anterior to upper lip or labrum, sometimes fused with frontal lamina. [Kensley and Schotte, 1989]