Apologies, @thomaseverest I thought I had commented about this one... Now I realize I had never put my partial thoughts out at all.
The species japonicum has often been considered only a local form of M. lacustre, so it would surprise me if it ended up in a different genus (or even subgenus).
It was not included in the 2023 analysis of Bespalaya et al, but it was included in Lee & Ó Foighill, 2003.
https://academic.oup.com/zoolinnean/article/137/2/245/2632282 In that paper, it was in Musculium with M. miyadii, M. lacustre, M. partumeium, M. securis, and M. argentinum.
Oavsiktliga oenigheter uppstår när en förälder (B) gallras
genom att byta plats på ett barn (E) till en annan del av det
taxonomiska trädet, med resultatet att befintliga bestämningar av föräldern tolkas
som oenigheter med befintliga bestämningar av det utbytta barnet.
Identification
Bestämning 2 av taxon E kommer att bli en oavsiktlig oenighet med bestämning 1 av taxon B efter taxonbytet
Om gallring av en förälder resulterar i mer än 10 oavsiktliga oenigheter, bör
du dela upp föräldern efter att ha bytt ut barnet för att ersätta befintliga bestämningar
av föräldern (B) med bestämningar som inte är oeniga.
Apologies, @thomaseverest I thought I had commented about this one... Now I realize I had never put my partial thoughts out at all.
The species japonicum has often been considered only a local form of M. lacustre, so it would surprise me if it ended up in a different genus (or even subgenus).
It was not included in the 2023 analysis of Bespalaya et al, but it was included in Lee & Ó Foighill, 2003.
https://academic.oup.com/zoolinnean/article/137/2/245/2632282
In that paper, it was in Musculium with M. miyadii, M. lacustre, M. partumeium, M. securis, and M. argentinum.