Four new and one known species of Belondiroidea (Dorylaimida: Nematoda) from Japan

Four new and one known species of Belondiroidea Thorne, 1939 Thorne, G. 1939. A monograph of the nematodes of the superfamily Dorylaimoidea. Capita Zool., 8: 1–261.  Google Scholar] are reported from Japan. Axonchium mizukuboi sp. nov. has isthmus-like constriction between two parts of pharynx; rectangular pars refringens vaginae; spicules with thickened distal end; seven ventromedian supplements starting above the range of spicules and hemispheroid tail. Axonchium japonicum sp. nov. also has short isthmus-like structure between two parts of pharynx; triangular pars refringens vaginae; massive spicules with thickened distal tip and 9–10 ventromedian supplements. Dorylaimellus (D.) japonicus sp. nov. has 0.9–1.0 mm long body; poorly flanged odontophore; pharyngeal expansion 54–65% of neck length; 22–25 μm long, strongly ventrally arcuate spicules; four ventromedian supplements and elongate conoid tail with subacute terminus. Dorylaimellus (Axodorylaimellus) paracrassidens sp. nov. has 0.4–0.5 mm long body; slender odontostyle; pharyngeal expansion 48–57% of neck length; transverse vulva; long prerectum and short conoid tail. Axonchium amplicolle Cobb, 1920 Cobb, NA. 1920. One hundred new nemas. Contrib Sci Nematol., 9: 217–343.  Google Scholar] is reported for the first time from Japan.