在觸角之后,頭之兩側,常有各種數目的單眼,其數每側常少于8個,也有全無者,如Onychiurus(Lipura)及Cyphoderus等。有的種類在觸角之后和眼的前方有一特殊構造(圖2-2),稱角后器(post-antennal organ),或稱眼前器(prostemmatic or anteocular organ)。此項構造,因屬的不同而異,如Isotoma為簡單環形、Anurida為環形花瓣狀,Onychiurus則較復雜。此項器官,與神經相連,為感覺器的一種。又因所蓋角皮較薄,可能有接受外來刺激而有嗅感作用,擬蟲類無單眼而有角后器(Lubbock)。
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