Lumbriculus genitosetosus

Unreferenced|date=April 2007Taxobox
name = "Lumbriculus genitosetosus"
regnum = Animalia
phylum = Annelida
classis = Clitellata
subclassis = Oligochaeta
ordo = Lumbriculida
familia = Lumbriculidae
genus = "Lumbriculus"
species = "L. genitosetosus"
binomial = "Lumbriculus genitosetosus"

"Lumbriculus genitosetosus" was described by Holmquist in 1976 from almost 2,000 individuals collected in Northern Alaska. Initially, Holmquist revived the genus "Thinodrilus" (previously established by Smith in 1895 for "Th. inconstans") for "L. genitosetosus", "Lumbriculus inconstans" and "Lumbriculus ambiguus" on the basis of the "Lumbriculus"-species having only one pair of vas deferens and sperm funnels per atrium, whereas the "Thinodrilus"-species have two (one in the anterior end and one in the posterior); this division is, however, not generally recognised today, even if "Thinodrilus" may be a valid subgenus.

"L. genitosetosus", as the name suggests, can be recognised by its modified male genital setae, unique within the Lumbriculidae.