One new species of Stegocephalus Kroyer, 1842 (Amphipoda, Stegocephalidae) described from a seamount of the Caroline Plate, NW Pacific Author Wang, Yanrong https://orcid.org/0000-0002-7188-4232 Department of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China & College of Biological Sciences, University of Chinese Academy of Sciences, Beijing 100049, China Author Sha, Zhongli https://orcid.org/0000-0002-2192-3758 Department of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China & College of Biological Sciences, University of Chinese Academy of Sciences, Beijing 100049, China & Laoshan Laboratory, Qingdao 266237, China shazl@qdio.ac.cn Author Ren, Xianqiu https://orcid.org/0009-0003-4119-397X Department of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China text ZooKeys 2024 2024-03-14 1195 121 130 http://dx.doi.org/10.3897/zookeys.1195.114209 journal article http://dx.doi.org/10.3897/zookeys.1195.114209 1313-2970-1195-121 153B616F03404CBBBFA66A67A2A0BA6A AAA7A052EDDA5E098039F89979E569E2 Genus Stegocephalus Kroyer , 1842 Diagnosis. Body smooth. Antenna 2 with peduncular article 4 shorter or longer than article 5. Epistomal plate absent. Mandible incisor lateral, toothed; left lacinia mobilis powerful, toothed, distally produced. Maxilla 1 palp well developed, 1- or 2-articulated. Outer plate of maxilla 2 gaping and geniculate, with setae distally with hooks (absent in S. ampulla ). Palp of maxilliped 4-articulated, article 2 unproduced or inner margin produced distally. Pereopods 1-2 simple. Pereopod 6 basis conspicuously expanded. Uropod 3 biramous, outer ramus l-articulate, peduncle shorter than rami. Telson elongate, cleft (amended after Barnard and Karaman 1991 ; Berge and Vader 2001 ).