Mesenchytraeus similigigachaetus Chen et al., 2023 (T) (endemic to China)

Mesenchytraeus similigigachaetus Chen et al., 2023 .

Type locality. Soil and moss layer of hardwood forest (127°49′21.19″E, 42°17′39.82″N; 1049 m asl), Changbai Mountain, Jilin Province.

Distribution and habitat. Only recorded in Changbai Mountain. Terrestrial.

Distribution in China. Jilin Province.

Mesenchytraeus sp. (spermatheca with a crown of diverticula-like protrusions) (T) (endemic to China)

Distribution in China. Jilin Province.