Having thread-like or spear-shaped antennae; relating to or characterized by the antenna structure of Athericera insects.
From atheri- (thread, spear) + -cerous (from keras, horn; relating to antennae), literally meaning 'spear-horned' or 'thread-antennae'd.
This is a perfect example of how scientific terminology is beautifully logical—if you know Greek roots, you can understand that 'athericerous' literally means 'having spear-like horns' without ever looking it up.
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