Actually , the term coral is much broader and refers to most of the animals in the class Hydrozoa of the Phylum Cnidaria .
其实珊瑚一词所指的动物甚多，包括大多数属珊瑚虫纲及数动属水螅虫纲的刺胞动物。
The species composition , Quantitative distribution and seasonal variation of Medusae in the Bohai Sea were determined in a discontinuous period from 1959 to 1997.There were totally 41 species , among which were 35 species of Hydrozoa , 4 species of Scyphomedusae and 2 species of Ctenophore , respectively .
