Hydrichthella ocellata

Material examined. Holotype SFI 001, southern of South China Sea, st. B 4 (10 ° 16 ' N, 114 ° 13 ' E), depth 2000 m, sampling depth 20 – 0 m, 22 May 2014, colls. Shen Chen & Jie Li (SFRI). Diagnosis. Free eumedusoid, umbrella nearly spherical; with short and wide gastric peduncle, with 4 large mass-like gonads, interradial on manubrium; bell margin with 8 non-tentacular bulbs, 4 perradial larger than 4 interradial bulbs, each with a distinct red ocellus at the extreme tip. Description. Medusa reduced to short-living eumedusoid; umbrella up to 1 mm high, nearly as wide as high in preserved specimen; mesoglea about 1 / 3 – 1 / 4 diameter of exumbrella; exumbrella covered with nematocysts, without exumbrellar furrows and didermic centripetal tracks; manubrium hanging from short and wide peduncle, mouth more or less quadratic in shape with simple mouth lips; 4 gonads interradial, extending to adradial on manubrium, smooth without folded; with 4 radial canals and circular canal; umbrella margin with 8 non-tentacular bulbs, 4 perradial larger than 4 interradial bulbs, each with a distinct red ocellus at the extreme tip; velum middle broad. Hydroid. Unknown. Distribution. Southern South China Sea. Etymology. The specific name refers to the Latin ocellata, meaning ocellus. The eumedusoid name refers to the marginal bulbs each with a red ocellus at the extreme tip. Remarks. Although only one specimen was found, its good preservation of morphological characters suggests that a new eumedusoid is present. The eumedusoid of Hydrichthella ocellata Xu, Huang & Wang, sp. nov. is very similar to the eumedusoid of H. epigorgia Stechow, 1909 (redescribed by Hirohito (1988 )), by the bearing eumedusoids with four radial canals, 8 marginal bulbs, 4 large, mass-like gonads, interradial positions on manubrium, with velum. But the eumedusoid of H. ocellata Xu, Huang & Wang, sp. nov. is clearly different from H. epigorgia by free swimming eumedusoid with exumbrellar scattered nematocysts, with a short and wide gastric peduncle, 8 marginal bulbs, 4 perradial bulbs larger than 4 interradial bulbs, each with a red ocellus at the extreme tip (Figs 1 – 4).