dīˈplu̇r(y)ələ noun
( plural dipleurulas -ləz ; or di·pleuru·lae -ˌlē)
Etymology: New Latin, from dipleura bilaterally symmetrical organisms (from di- + -pleura ) + -ula
1. : a hypothetical bilaterally symmetrical echinoderm larva sometimes regarded as a common ancestor of echinoderms and chordates
2. : a larval echinoderm (as a bipinnaria or an echinopluteus) — not used technically