南海筒螅水母亚目二新种(花水母亚纲,头螅水母目)

Two New Species of Suborder Tubulariida from the South China Sea(Anthomedusae,Capitata)

发现了采自南海的花水母亚纲(Anthomedusae Haeckel,1879)头螅水母目(Capitata Kühn,1913)筒螅水母亚目(Tubulariida Fleming,1828)的2个新种:1)囊水母科(Euphysidae Haeckel,1879)内胞水母属(Euphysilla Kramp,1955)管内胞水母(E.tubularia Huang,Xu et Lin,sp.nov.);2)筒螅水母科(Tubulariidae Fleming,1828)外肋水母属(Ectopleura L.Agassiz,1862)南海外肋水母(E.nanhaiensis Huang,Xu et Guo,sp.nov.).分别描述了两者的鉴别特征和形态特征,附形态图,并与同属相似种进行了比较.模式标本保存于国家海洋局第三海洋研究所.

Samples of Tubulariida were collected from the South China Sea （0°-20°N, 102°-115°E） in June-August, 2012. Two new species,Euphysilla tubularia Huang, Xu et Lin, sp. nov. and Ectopleura nanhaiensis Huang, Xu et Guo, sp. nov. , are described in this paper. The type specimens are deposited in the Third Institute of Oceanography, State Oceanic Administration. The specific char- acteristics for diagnosis of two new species are as follows： i） Euphysilla tubularia Huang,Xu et Lin, sp. nov. Umbrella dome-shaped,without apical projection;exumbrella with scattered cnidocysts;manubrium large, extending not beyond umbrella margin;gonads in the upper part, tubular oral tube in the lower part;4 short marginal tentacles, each with 9 transverse nem- atocyst clasps on near adaxial side,with 4 to 5 circular nematocyst ribs on distal part and with prominent terminal knob of nemato- cysts;4 broad,flat tentacle bulbs;4 radial canals and one circular canal. ii） Ectopleura nanhaiensis Huang, Xu et Guo, sp. nov. Umbrella peal-shaped,without apical projection;exumbrella with 4 pairs of longitudinal cnidocysts tracks originating from mar ginal bulbs, extending to apex of umbrella, along the edges of eight very prominent ridges;fairly long manubrium, about 4/5 length of umbrella cavity,almost reaching velum but not beyond,with 4 interradial saccus gonads on it;4 perradial marginal bulbs, unequal sizes;two opposite perradial marginal bulbs larger than other two opposite non-tentacular bulbs, with short and hard tentacles, each tentacle with cyclical cnidocysts;4 radial canals and one circular canal.