FOUR NEW SPECIES AND TWO NEW RECORDS of HYDROZOA FROM THE NORTHERN of SOUTH CHINA SEA AND ITS ADJACENT WATERS,CHINA (CNIDARIA,AUTOMEDUSA,HYDROIDOMEDUSA)
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记述了南海北部近海水螅虫总纲4新种和2新纪录,即自育水母纲的顶胃穴水母SMInTHEA APICIgASTrICA Xu,HuAngET du,SP.nOV.,水螅水母纲的距拟双手水母COdOnOrCHIS CAlCArIfOrMIS Xu,HuAngET guO,SP.nOV.,南海多管水母AEQuOrEA nAnHAInEnSIS Xu,HuAngET du,SP.nOV.,四手多管水母AEQuOrEA TETrAnEMA Xu,HuAngET du,SP.nOV.,深水拟单手水母PArAgOTOEA bATHybIA krAMP,1942和母螅镰螅水母zAnClEA MEduSOPOlyPATA bOErO,bOuIllOnET grAVIlI,2000。并讨论了新种与近缘种的区别,模式标本保存在中国水产科学研究院南海水产研究所。Four new species and two new records Sminthea apicigastrica Xu, Huang et Du, sp.nov., Codonorchis calcariformis Xu, Huang et Guo, sp.nov., Aequorea nanhainensis Xu, Huang et Du, sp.nov., A.tetranema Xu, Huang et Du, sp.nov., Paragotoea bathybia Kramp, 1942 and Zanclea medusopolypata Boreo, Bouillon et Gravili, 2000, are described in this paper.The types are deposited in the South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science.Sminthea apicigastrica Xu, Huang et Du, sp.nov.(Figs.1-3, 11-13)Until only one species is known in genus Sminthea Gegenbaur, 1857.This new species is distinguished from Sminthea eurygaster Gegenbaur, 1857 by: 1) umbrella conical bell-shaped, with a high and round apical projection; 2) manubrium short, about 2/3 the length within subumbrellar cavity of apical projection; 3) 8 perradial tentacles are each flanked by a pair of gelatinous papillae.Holotype (SN001), Northern of South China Sea E8 Station (21°48′N, 116°53′E) , depth 145m, 18 Oct.2006, HUANG Zi-Rong (SFR).Paratype (SN002), Northern of South China Sea Station C9 Station (20°13′N, 114°51′E), depth 183m, 16 Oct.2006, HUANG Zi-Rong (SFR).Etymology.Apicigastrica, Latin.means apical gaster.The species name refers to position of manubrium within subumbrellar cavity of apical projection.Codonorchis calcariformis Xu, Huang et Guo, sp.nov.(Figs.4, 14-15)At present time, 3 species are known in genus Codonorchis Haeckel, 1879.This new species is closed to Codonorchis nanhainensis Xu, Huang et Guo, 2008, but differs from them by: 1)adradial gonads elliptical-shaped, about 2/3 the length of manubrium; 2) 4 perradial marginal bulbs all with a short abaxial spur and ocelli; 3) without club-shaped tentaclae between perradial marginal bulbs (Table 1).Holotype (SN003), Northern of South China Sea C9 Station (20°13′N, 114°51′E) , depth 183m, 16 Oct.2006, HUANG Zi-Rong (SFR).Paratype (SN004), Taiwan Strait JC-NH 527 Station (22°01′N,115°45′E), depth 83 m, 13 Dec.2007, WANG Yan-Guo (SOA).Etymology.From Latin.calcariformis, means spur-like, referring to the abaxial spur on the perradial marginal bulbs.Aequorea nanhainensis Xu, Huang et Du, sp.nov.(Figs.7-8, 18-19)Aequorea Peron et Lesueur, 1810 is a genus of Aequoreidae comprising 18 valid species.This new species can be easily distinguished from other members of Aequorea by the tentacular bulbs with an abaxial keel.Among the two species known with an abaxial keel on the tentacular bulbs, but this new species mostly resemble A.macrodactyla (Brandt, 1834) in lacking black pigmented patch on abaxial keel, the former differs from the latter by: 1) radial canals less than the number of mouth lips; 2) with 41 marginal tentacles, without excretory papillae; 3) with 3 marginal bulbs between tentacles; 4) with 2 statocysts between radial canals (Table 2).Holotype (SN005), Northern of South China Sea A5 Station (20°23′N, 111°16′E) , depth 57m, 1 Sep.2007, HUANG Zi-Rong (SFR).Etymology.From Latin.nanhainensis, means South China Sea, referring to the first collected from northern of South China Sea.Aequorea tetranema Xu, Huang et Du, sp.nov.(Figs.9-10, 20)This new species is distinguished from other members of Aequorea by the gonads no more than half as long as radial canals, only in distal of radial canals, which is closed to Aequorea australis Uchida, 1947, the former differs from the latter by: 1) the former umbrella lens-shaped, jelly very thick, but latter umbrella lower than a hemisphere, jelly rather thin; 2) the former gonads oval-shaped, extending along distal 1/4-1/3 of radial canals, but latter gonad linear, along distal 1/2 of radial canals; 3) the former four large tentacles with very large, almost globular bulbs, without excretory papillae, but latter 16-40 marginal tentacles and small bulbs with distinct excretory papillae; 4) the former 16 radial canals of different sizes, but latter 16-50 radial canals of equal sizes; 5) the former 4-5 statocysts between tentacles, but latter one statocyst between tentacles.Holotype (SN006), Northern of South China Sea A9 Station (19°16′N, 112°18′E), depth 179 m, 12 Oct.2006, HUANG Zi-Rong (SFR).Etymology.From Latin.tetranema, means four tentacles, referring to the four large tentacles.