Species of Reticulipeurus Kéler, 1958 (Phthiraptera, Ischnocera, Oxylipeurus-complex) parasitic on species of Arborophila, with description of a new subgenus and three new species.

A new subgenus and three new species of parasitic lice (Phthiraptera: Ischnocera) in the Oxylipeurus-complex are described and illustrated. Forcipurellus new subgenus is part of the genus Reticulipeurus Kéler, 1958, and only includes species parasitic on partridges of the genus Arborophila Hodgson, 1837. The new species are: Reticulipeurus (Forcipurellus) diki new species ex Arborophila rubrirostris (Salvadori, 1879); Reticulipeurus (Forcipurellus) bracatus new species ex Arborophila atrogularis (Blyth, 1849); Reticulipeurus (Forcipurellus) longistylus new species ex Arborophila rufogularis guttata Delacour & Jabouille, 1928 and two other host subspecies. In addition, we redescribe the species Reticulipeurus (Forcipurellus) formosanus (Uchida, 1917) ex Arborophila crudigularis (Swinhoe, 1864) and Reticulipeurus (Forcipurellus) nitzschi Kéler, 1958 ex Arborophila torqueola torqueola (Valenciennes, 1825) and Arborophila torqueola millardi (Baker, 1921). Also, we briefly discuss four additional species that could not be described based on the specimens examined. A key to identify all species in the subgenus Forcipurellus is provided, as well as an emendation to include Forcipurellus in a previously published key to the Oxylipeurus-complex.

Genetic variation in the popular lab worm Lumbriculus variegatus (Annelida: Clitellata: Lumbriculidae) reveals cryptic speciation.

Genetic variation in the freshwater oligochaete Lumbriculus variegatus from Europe, North America and Japan was studied by sequencing and analysing the mitochondrial 16S and COI genes, and the nuclear ITS region. What hitherto has been regarded as L. variegatus was found to consist of at least two distinct clades (I and II), both of which occur in Europe as well as North America (clade I also in Japan). Specimens from a single locality in Sierra Nevada, California, also morphologically identified as L. variegatus, represent a third clade, which appears to be more closely related to clade II than to clade I, based on 16S data only. Average COI genetic distances were 17.7% between clades I and II, 0.6% within clade I, and 1.3% within clade II. Further, for these two clades, the mitochondrial (16S and COI) gene trees, which consider only the maternal lineages, are congruent with the ITS gene tree, which is the result of recombinations of paternal as well as maternal genomes. Finally, chromosome counts revealed clade I specimens to be highly polyploid, and clade II specimens to be diploid. We therefore conclude that clades I-II are separately evolving lineages, and that they should be regarded as separate species. This will have to be taken into account in the continued use of L. variegatus as a model organism in biological sciences.