Labiostrombus epidromis, common name the swan conch, is a species of sea snail, a marine gastropod mollusk in the family Strombidae, the true conchs.

[1] The typical size of the adult shell varies between 50 and 95 mm.

The authors analysed 31 species in the genus Strombus including Labiostrombus epidromis (referred to as Strombus epidromis in their analysis), and three species in the allied genus Lambis.

The cladogram was based on DNA sequences of both nuclear histone H3 and mitochondrial cytochrome-c oxidase I (COI) protein-coding gene regions.

In this proposed phylogeny, Strombus epidromis (= Labiostrombus epidromis), Strombus vittatus (= Doxander vittatus) and Strombus canarium (= Laevistrombus canarium) are closely related and appear to share a common ancestor.