Morphology and phylogenetic analysis of five deep-sea golden gorgonians (Cnidaria, Octocorallia, Chrysogorgiidae) in the Western Pacific Ocean, with the description of a new species Author Xu, Yu Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China & University of Chinese Academy of Sciences, Beijing 100049, China Author Zhan, Zifeng Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China & Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China Author Xu, Kuidong Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China & Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China & Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China & University of Chinese Academy of Sciences, Beijing 100049, China kxu@qdio.ac.cn text ZooKeys 2020 989 1 37 http://dx.doi.org/10.3897/zookeys.989.53104 journal article http://dx.doi.org/10.3897/zookeys.989.53104 1313-2970-989-1 8957A11D00984990B073A1999A8AFBC6 0185198E253B50C4BAB71B6BBF0305AB Genus Pseudochrysogorgia Pante & France, 2010 Diagnosis (based on Pante and France 2010 ). Main stem monopodial or slightly zigzagging with branches subdivided dichotomously in multiple planes, forming a bottlebrush-shaped colony. Most polyps leaning distad and neck narrower than head. Sclerites slightly ornamented, in the form of plates, scales and rods. When polyp not leaning distad, sclerites arranged obliquely on the polyp body. When polyps leaning distad, sclerites mostly arranged longitudinally (parallel to branch) on the polyp body, placed obliquely in the area of neck, and arranged longitudinally on head and along the back of tentacles. Scales and plates in branch coenenchyme mostly parallel to main branch axis. Type species. Pseudochrysogorgia bellona Pante & France, 2010. Distribution. Southwest Pacific (Coral Sea and northeast of New Zealand), 800-1462 m depth ( Pante and France 2010 , Pante et al. 2012 ). Figure 15. External morphology and polyps of Metallogorgia macrospina MBM286488 A the colony in situ . Laser dots spaced at 33 cm used for scale B close-up of branches in situ C the colony after collection D a branch under a light microscope E, F a single polyp under a light microscope G three polyps under SEM H head of one polyp under SEM I coenenchyme under SEM. Scale bars: 10 cm ( C ); 2 mm ( D ), and 500 μm ( E-I; H, I at the same scale). Figure 16. Sclerites of Metallogorgia macrospina MBM286488 A rods in tentacles B rods in the polyp-body wall C rods and elongated scales in coenenchyme. Scale bar: 200 μm (all images at the same scale). Figure 17. External morphology and polyps of Metallogorgia macrospina MBM286489 A the colony in situ . Laser dots spaced at 33 cm used for scale B the colony after collection C a branch under a light microscope D a terminal branchlet under a light microscope E, F a single polyp under a light microscope G three polyps under SEM H head of one polyp under SEM I coenenchyme under SEM. Scale bars: 10 cm ( B ), 2 mm ( C ), and 500 μm ( D-I; H, I at the same scale). Figure 18. Sclerites of Metallogorgia macrospina MBM286489 A rods in tentacles B rods in the polyp-body wall C rods and elongated scales in coenenchyme. Scale bar: 300 μm (all at the same scale).