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 a well developed projecting 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 30 mm or more in length, and the latter has conspicuous fringing setae on the metazonites.  The male gonopods are characteristic.

A brief description, with figures, is given by Gregory, Owen, Jones & Williams (2018), who also note the occurrence of the ectoparasitic fungus Rickia laboulbenioides.

Steve Gregory
Keith Lugg
Keith Lugg
Keith Lugg
Christian Owen
Greg Jones
Steve Gregory

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.

BRC code