The life-history of the julid millipede Cylindroiulus nitidus in a Derbyshire wood


  • *School of Life Sciences, N.S.W. Institute of Technology, Gore Hill, NSW 2065, Australia.


A population of C. nitidus in a deciduous wood at Milldale, Derbyshire included adult males with 36 to 54 podous segments but the highest number of segments possessed by immature males was 38. The occcurrence of males in successive stadia is contrasted with the alternation of copulatory and intercalary males in some other juliform millipedes.

Samples were taken to determine the course of post-embryonic development and life-history in the field. Stadial determination by counting rows of ocelli was not possible but a separation was made by analysis of dimensions. These dimensions and segmental formulae are compared with those of German examples. No intercalary or other modified post-imaginal male stages were present.

From a comparison of the distribution of stadia in five samples it appears that males mature in three and females in four years. Males survive a further four to five, females a further three years after first achieving maturity. The significance of the special and general life-history characters of the species are discussed.