Frontal orbits see genovertical plates

frontal organ (ARTHRO: Crustacea) a. Sensory cells on the anterior surface of the cephalon of malacostracans; the haft organ or frontal eye in non-malacostracans. b. The Bellonci organ of ostracods. see organ of Bellonci, frontal eye complex, x-organ.

frontal plane A plane or section parallel to the body main axis and at right angles to the sagittal plane; horizontal plane.

frontal plate (ARTHRO: Crustacea) In brachyuran Decapoda, a modified rostrum with a downward projecting process united with the epistome.

frontal plate of the tentorium (ARTHRO: Insecta) The plate formed by fused anterior arms of the tentorium.

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