Studies on western Pacific gorgonians (Anthozoa: Octocorallia, Chrysogorgiidae). Part 1: a review of the genus Chrysogorgia, with description of a new genus and three new species Author Xu, Yu 0000-0002-4937-122X xuyu@qdio.ac.cn Author Zhan, Zifeng 0000-0003-4386-0687 zzhan@qdio.ac.cn Author Xu, Kuidong 0000-0002-5186-519X kxu@qdio.ac.cn text Zootaxa 2023 2023-07-28 5321 1 1 107 http://dx.doi.org/10.11646/zootaxa.5321.1.1 journal article 59774 10.11646/zootaxa.5321.1.1 17286f54-3d8c-4a4f-a12b-7f9baf1dbe17 1175-5326 8203414 A1F2E418-67A3-4D1F-ABC9-6C2BA0F5190E Chrysogorgia ramificans Xu, Li, Zhan & Xu, 2019 Figs. 46 , 47 Chrysogorgia ramificans Xu, Li, Zhan & Xu, 2019: 94–97 , figs. 2–3. Material examined. MBM286861 , station FX-Dive 223 ( 10°4′42″N , 140°15′12″E ), a seamount (tentatively named as M7) on the Caroline Ridge, 1047m , 11 June 2019 . Description. Colony typical bottlebrush-shaped and attached to a rocky substrate ( Fig. 46 A ). Specimen about 36 cm long and 15 cm wide in maximum with the holdfast not recovered ( Fig. 46 B ). Main stem about 1.5 mm in diameter at base and brown to yellow with metallic luster. Branching sequence 1/ 3L. Branches subdivided dichotomously, up to five orders with branching angle 80°–100°. Distance between adjacent branch 6–12 mm , orthostiche intervals 17–34 mm , the first internode of branch 8–27 mm and the terminal branchlets up to 31 mm . Polyps cylindrical, some of them curved, usually perpendicular to the branches, 1.0– 2.5 mm tall average 2 mm , and 0.5–1.0 mm wide ( Fig. 46C, E, F ). Polyps up to three and became very small on the first internode, up to four in medial internodes and up to five in terminal branchlets. Polyps absent in stem internodes and verruae absent. Tentacular part 0.5–1.0 mm long with tentacle rachis forming eight obvious columns ( Fig. 46E ). Rods and spindles in polyp body wall longitudinally or obliquely arranged, large and thick, rarely branched with many large and coarse warts, occasionally with irregular edges and shape, measuring 115–529 × 49–141 μm ( Fig. 47D ). Rods and spindles in tentacle rachis longitudinally arranged extending to the polyp neck, all covered with many large and coarse warts, some of them branched with irregular shape, measuring 135–459 × 23–106 μm ( Fig. 47A ). Scales in pinnules transversely arranged, small with finely toothed ends and sparse warts on surface, some of them curved or twisted with a medial contraction, occasionally nearly smooth, measuring 114–148 × 21–60 μm ( Figs. 46D , 47B ). Scales in coenenchyme arranged along to the branch, elongated and flat with dentate edges and a few large warts, some of them smooth and thick, measuring 223–671 × 35–118 μm ( Figs. 46G , 47C ). Distribution and habitat. The Kocebu Guyot in Magellan Seamounts, 1831 m ( Xu et al. 2019 ); a seamount on the Caroline Ridge in the Western Pacific, 1047 m . Remarks. The colony of the Caroline specimen has a single bottlebrush-shaped branching part and smaller polyps compared with the holotype , and these differences may be caused by different growth stage or environment, and we treat as the intraspecific variation.