[Cubo-/Scyphomedusae] Flaps on the margin of the scyphozoan disc, somewhat regular in arrangement; much varied in size but typically from 8 to ca. 100 in number. There is confusion in the literature on some species about whether or not the lappets should be counted in pairs, with each pair comprising a single lappet which is cleft in two (as is clearly so in Cyanea). Hence lappet-counts by some authors of some species may be double those of other authors. In at least some rhizostomes the number of lappets increases gradually with age (perhaps to a more or less constant maximum); but in some others, such as some coronate medusae, it is more fixed, especially once development is complete. Rhopalial lappets (formerly termed ocular lappets) occur one each side of the rhopalial niche. In most species they differ in size and/or shape to a varied extent from the remaining or inter-rhopalar lappets (= velar lappets).