【摘要】 <正> 筒星珊瑚属(Tubastraea)在分类上属石珊瑚目(Scleractinia)木珊瑚科(Dendrophyllidae)。本属动物从白垩纪中期出现以来,一直都有生长。今天生活着的筒星珊瑚已知有5个种,它们分布于印度洋、太平洋及大西洋的广大海域。 自Lesson(1834)建立筒星珊瑚属以来,科学家们对该属动物已有不少报导。但是,由于其较易受环境影响而发生变异,所以在筒星珊瑚属种的描述上往往产生很大差异,并且时常有合有分,情形较为混乱。因此,寻求新的方法,以反映种类之间的内在异同,从而纠正只凭直观的形态分类所产生的混乱情形,显得十分必要。更多还原

【Abstract】 The author used a clustering analysis method by means of computer to proceed numerical taxonomy for all samples of Tubastraea available. According to the features of these animals, 12 variables were selected as criteria for numerical taxonomy. In calculation values of these variables for every sample were standardized previously, and then, the distance coefficient formulawas used to compute the distances of all samples in pairs. Finally, samples were grouped gradually using"the closed neighbouring connecting method"and a dendrogram could be obtained. Taking distance coefficient d= 0 .8500 as a boundary, the samples could be divided into 5 groups and every group represented one species. They were:(1)Tubastraea aurea;(2)T.tenuilamellosa; (3)T. coccmea; (4) T.titijimaensis and(5)T.biaphana.Basing on the result of numerical analysis, in the paper a species is nominated as T. titijimaensis which was recorded by Eguchi(1968)as Tubastraea coccinea titijimaensis.The five species of Tubastraea mentioned in this paper are the only five species of this genus, which have been recorded and known to the world, thereby, their wide geographic distribution is reflected.All of them are first recorded in China.更多还原