Genus Pithemera Sims & Easton, 1972

Pithemera Sim & Easton, 1972: 202 .

Type species. Perichaeta bicincta Perrier, 1875, by original designation.

Distribution. Mainly in Pacific Isls, e.g. Solomon Isl., New Britain, Fiji, Samoa, Philippines (Sims & Easton 1972: 202; Blakemore 2002: 223, 2012a).

Remarks. Members of the genus are easily recognized by the presence of intestinal caeca at xxi–xxiv, absence of copulatory pouches, and single or paired female pores on xiv. Currently, twelve species have been described (Csuzdi 2012), but only one has been found in Vietnam.