Cylindroiulus pyrenaicus (Brölemann, 1897)

Common name

Welsh Two-tail



ID Difficulty



Cylindroiulus pyrenaicus is a distinctive species since it bears both a projecting telson and ventral scale.
In Britain and Ireland, this combination of characters is otherwise only seen in C. apenninorum and Enataiulus armatus.  The former is much larger, reaching 30mm or more in length, and the latter has conspicuous fringing setae on the metazonites.  The male gonopods are characteristic.
A description, with figures, is given by Gregory, Owen, Jones & Williams (2018), who also note the occurence of the ectoparasitic fungus Rickia laboulbenioides.
Keith Lugg
Steve Gregory
Keith Lugg
Keith Lugg
Keith Lugg
Greg Jones

Distribution and Habitat

Although first discovered in the Kenfig catchment, Glamorganshire, south Wales in 2004, it was not identified until re-found at nearby site in 2017 (Gregory, Owen, Jones & Williams, 2018).



Gregory, S.J., Owen, C., Jones, G. & Williams, E. (2018) Ommatoiulus moreleti (Lucas, 1860) and Cylindroiulus pyrenaicus (Brölemann, 1897) new for the UK (Diplopoda, Julida: Julidae).  Bulletin of the British Myriapod & Isopod Group 30: 48-60.