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The genus  Macrostomum  (Platyhelminthes: Macrostomorpha) is a group of cosmopolitan free-living flatworms that occurs in a wide range of habitats. In our study, individuals of  Macrostomum velastylum  were collected from the Sagastume stream (33°38ʹ34ʺS; 58°49ʹ63ʺW) Entre Ríos Province, Argentina, during 2016. They were kept in laboratory at room temperature in order to study population parameters (1, fecundity; 2, hatching rate and hatching time; 3, male sexual maturation time; and 4, longevity). The results show that this species laid 1.5 eggs per day per individual, the hatching rate was 85% and most eggs hatched between the first and second week after laying. The maturation time showed an extensive range of time to reach sexual maturation. The average longevity was 96 ± 33 days. Considering the laboratory conditions and the scarce information on life cycles on  Macrostomum  species, these results are promising for future interspecific comparative studies.

Life history of the freshwater microturbellarian Macrostomum velastylum (Macrostomorpha) in the Neotropical region