Three new tubificine species (Annelida: Clitellata: Naididae) from Japan.

Three new species of Tubificinae (Oligochaeta: Naididae), Aulodrilus penicillatus sp. nov., Haber subnivalis sp.

A taxonomic reassessment of Cirrodrilus japonicus (Pierantoni, 1912) (Annelida, Clitellata, Branchiobdellida).

Cirrodrilus japonicus (Pierantoni, 1912) has not been identified since it was originally described from specimens removed from preserved Japanese crayfish that had been deposited in the Natural History Museum in Hamburg, Germany. A morphological comparison of the published description and recently discovered syntypes of C. japonicus from the Hamburg Museum with syntypes and newly collected material of Cirrodrilus ezoensis (Yamaguchi, 1934), supported the view that preservation artifacts in C.

Taxonomical study of Japanese emAulodrilus/em Bretscher (Annelida, Clitellata, Tubificinae) with descriptions of two new species.

Seven species of the genus Aulodrilus (Annelida, Clitellata, Tubificinae) are studied, based on new material from Japan. Aulodrilus dentosus sp. nov.

Multi-locus phylogenetic analysis of the genus Limnodrilus (Annelida: Clitellata: Naididae).

Limnodrilus species are annelid worms distributed worldwide in various freshwater sediments. The systematics of Limnodrilus has chiefly been based on morphology, but the genus has not been subject to any closer phylogenetic studies over the past two decades. To reconstruct the evolutionary history of Limnodrilus, and to assess the monophyly of this genus and its systematic position within the subfamily Tubificinae (Annelida: Clitellata: Naididae), 45 Limnodrilus specimens, representing 19 species, and 35 other naidid species (representing 24 genera) were sampled.

Redescriptions of Spirosperma apapillatus and Embolocephalus nikolskyi (Annelida, Clitellata, Tubificinae) from Japan, with reference to distribution of papillate tubificines in Japanese freshwaters.

Based on new specimens, two freshwater papillate tubificines, Spirosperma apapillatus (Lastočkin in Lastočkin and Sokolskaja, 1953) and Embolocephalus nikolskyi (Lastočkin in Lastočkin and Sokolskaja, 1953) are redescribed, and geographic distributions are shown for these two species and E. yamaguchii (Brinkhurst, 1971) in the Japanese archipelago. A geographic cline from northern Hokkaido to northern Honshu is suggested by the distribution of simple-pointed ventral chaetae in Japanese E.

Yamaguchia toyensis n. sp., n. gen. (Annelida, Clitellata, Lumbriculidae) from profundal Lake habitat in Japan.

Yamaguchia toyensis n. sp., n.

A new species of the subterranean genus Krenedrilus dumnicka (Oligochaeta, Tubificidae) from the deep bottom of an oligotrophic caldera lake in Japan.

A new tubificid oligochaete, Krenedrilus towadensis, is described from deep bottoms of the oligotrophic caldera Lake Towada in northern Japan. It resembles K. realis Martínez-Ansemil and Collado, 1996, in the combination of somatic setae, but it is different from all other congeners by the lack of spermathecal setae and epidermal papillae in X, in the structures of penial and supernumerary setae, and in the location of spermathecal pores.