This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
蜽 combines 虫 (insect) with 兩, which likely contributes the sound. The exact historical development is uncertain.
The left side is 虫 (insect), and the right side is 兩. Without a clear meaning, picture a mysterious insect with two distinct parts, like a pair of wings or antennae.
For リョウ, imagine a rare insect named Ryo: Ryo -> リョウ, and the insect shape 虫 helps you remember the kanji.