''Undulus'' is a genus of armoured

harvestmen The Opiliones (formerly Phalangida) are an Order (biology), order of arachnids, Common name, colloquially known as harvestmen, harvesters, harvest spiders, or daddy longlegs (see below). , over 6,650 species of harvestmen have been discovered w ...

in the family

Phalangodidae The Phalangodidae are a family of harvestman, harvestmen with about 30 genus, genera and more than 100 described species, distributed in the Holarctic region. It is not to be confused with the harvestman family Phalangiidae, which is in the su ...

. There is at least one described species in ''Undulus'', ''U. formosus''.

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Further reading