The hindgut of the diplopod Pachyiulus flavipes is inhabited by specif
ic yeast populations. The yeast communities consist almost exclusively
of ascomycetes, viz., Debaryomyces hansenii, Torulaspora delbrueckii,
and Zygowilliopsis californica. Evidence is provided that the yeasts
isolated from the gut can be considered symbionts that remain in a ste
ady state under different feeding and rearing conditions.