Two new species of Chromadorida (Nematoda) from the intertidal zone of the Yellow Sea, China

Two new species of free-living marine nematodes were discovered off the coast of the Yellow Sea, China, and they are described here as Actinonema diplobulba sp. nov. and Nannolaimoides brevicaudatus sp. nov. Actinonema diplobulba sp. nov. is characterised by amphideal fovea transverse oval-shaped, pharynx with double posterior bulbs, single spicule slender, arcuate with cephalated proximal end, gubernaculum spinous, and extra hammer-shaped lateral pieces (telamon) present. This species is distinguished from its congeners in having double pharyngeal bulbs and both spicule and telamon. Nannolaimoides brevicaudatus sp. nov. is characterised by a slender body with irregular lateral differentiation, multispiral amphideal fovea with five turns and close to anterior end, spicules arcuate with bent proximal end and tapered distal end, gubernaculum expanded distally and tapered proximally, a precloacal papilla and 14 button-shaped precloacal supplements almost equally arranged, and a conico-cylindrical tail 4.3-4.9 times as long as cloacal body diameter. This species differs from its congeners by having a precloacal papilla and 14 button-shaped precloacal supplements, and a comparatively short conico-cylindrical tail.http://www.zoobank.org/urn:lsid:zoobank.org:pub:D74795FE-168E-4F7F-A78C-08EF5B9783A9