Component (a building block) — not the same thing as a radical or a sound component. · 6strokes
浊烛独茧萤虹虽虾
Kangxi radical no.142 · 6strokes — The 214 Kangxi radicals
Filed under it in a dictionary. That is a lookup convention — it does not mean it is the only part the character is built from.
虫虹虾蚀蚁蚂蚊蚌