Two new species of the genus Paracyatholaimus Micoletzky (Nematoda: Cyatholaimidae) from the Yellow Sea

Abstract

Two new free-living marine nematode species of Paracyatholaimus Micoletzky, 1923 Paracyatholaimus qingdaoensis sp. nov. and Paracyatholaimus huanghaiensis sp. nov. from the Yellow Sea, China are described. Paracyatholaimus qingdaoensis sp. nov. is characterized by cylindrical body with conical tail; spicules reverse S-shaped, distally pointed; gubernaculum plate, with two cusps at distal end, parallel to the spicules; 10 thick setose precloacal supplements in a 5 + 5 arrangement, anterior group of five supplements located at a protuberance. Paracyatholaimus huanghaiensis sp. nov. is characterized by a cylindrical body with conic-cylindrical tail; slender spicules curved, distally pointed; gubernaculum handle-shaped, expanding distally to a plate, with some sawteeth at distal end; three papillose precloacal supplements, each papilla protruding conically with cuticularized narrow ducts. A key for identification of species of Paracyatholaimus is proposed. http://www.zoobank.org/urn:lsid:zoobank.org:pub:0A8E40E5-AE7A-47DA-B755-61E1D088C1E9

Keywords:

• free-living marine nematode
• Paracyatholaimus qingdaoensis sp. nov.
• Paracyatholaimus huanghaiensis sp. nov.
• taxonomy

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos 30770250 and 41176107). The authors would like to thank Ms Yan Zhang and Xiuqin Wu for their kind help in sample collection and slide making. We are also grateful to Prof. Alexei V. Tchesunov for providing related references and two reviewers for their valuable comments for the manuscript.