is a species of the class Macrostomorpha in the family Microstomidae and order Dolichomicrostomida.
Microstomum achroophthalmum
Microstomum bioculatum
Microstomum bispiralis
Microstomum breviceps
Microstomum canum
Microstomum coerulescens
Microstomum crildensis
Microstomum davenporti
Microstomum dermophthalmum
Microstomum gabriellae
Microstomum groenlandicum
Microstomum hanatum
Microstomum jenseni
Microstomum lineare
Microstomum littorale
Microstomum lucidum
Microstomum melanophthalmum
Microstomum mortenseni
Microstomum mundum
Microstomum ornatum
Microstomum papillosum
Microstomum paradii
Microstomum philadelphicum
Microstomum punctatum
Microstomum rhabdotum
Microstomum rubromaculatum
Microstomum septentrionale
Microstomum spiculifer
Microstomum spiriferum
Microstomum trichotum
Microstomum ulum
Microstomum unicolor