Janthinoidea is a superfamily of sea snails containing wentletraps (Epitoniidae) and surfing snails (Janthinidae).

It includes species that have tethered egg masses, some of which are used for flotation.

[1] Molecular evidence supports a tree for Janthinoidea that shows the sequential development of traits for a neustonic life.

[1] The wentletraps (Epitoniidae) have tethered egg masses that started to be used for flotation in Recluzia and then totally divorce from its original function for the ovoviviparous Janthina janthina.

[1] Surrepifungium costulatum Surrepifungium ingridae Epidendrium sordidum Epitonium tinctum Epitonium ancillotoi Opalia chacei Cirostrema varicosa Recluzia cf.