Three new species of free-living nematodes from the Bohai Sea, China

Three new species of free-living marine nematode, Setosabatieria jingjingae sp. nov., Amphimonhystera circula sp. nov. and Belbolla zhangi sp. nov., from the Bohai Sea, China, are described and illustrated. Setosabatieria jingjingae can be separated from the other two species in the genus by the number of amphid turns, the structure of the spicules and the number of pre-cloacal supplements. A pictorial key and tabular information are provided to facilitate species identification in this genus. Amphhnonhystera circula is characterized by circular amphids, a simple gubernaculum and the shape of the tail. Belbolla zhangi is characterized by the number of oesophageal bulbs, the shape of the spicules and gubernacular apophysis, and the size of the two pre-cloacal supplements. The types are deposited in the Natural History Museum (London).