frontal organ
From ZooTerms (Dictionary of Invertebrate Zoology)
frontal organ also organ of Bellonci, frontal eye complex, x-organ: (Arthropoda: 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.
