Replacement names for Eutrigaster (Graffia) Csuzdi & Zicsi, 1991 and Dichogaster (Malawia) Csuzdi, 2010 (Oligochaeta, Acanthodrilidae).

The earthworm genus Eutrigaster Cognetti, 1904 has long been in synonymy with Dichogaster Beddard, 1888 until Sims (1987) resurrected it for the Central American Dichogaster-like species possessing a muscular proventriculus in segment 5. Today the genus consists of some 50 species distributed in two subgenera (Csuzdi 2012). The subgenus Eutrigaster (Graffia) Csuzdi & Zicsi, 1991 was erected for species that differ from the type species of the genus in possessing penial setae. According to the summary by Fragoso & Brown (2007) the subgenus Graffia contained 27 taxa. Later, further three species were described (Sherlock et al. 2011; Sherlock & Csuzdi 2013). However, the subgenus name Graffia is a junior homonym of the turbellarian genus Graffia Levinsen, 1879. (A further junior homonym Graffia Ihering, 1880 (Platyhelminthes: Turbellaria) has already been renamed as Graffilla Ihering, 1880). Here the replacement name Eutrigaster (Graffiona) nom. nov. is proposed for the earthworm subgenus Eutrigaster (Graffia).