福建沿海水螅水母四新种记述：（裸鞘花水母亚纲,被鞘软水母亚纲）

本文报道福建沿海类４新种,既六辐拟线水母Ｎｅｍｏｐｓｉｓ ｈｅｘａｃａｎａｌｉｓ ｓｐ．ｎｏｖ．,福建无垂水母Ｏｒｔｈｏｐｙｘｉｓ ｆｕｊｉａｎｅｎｓｉｓ ｓｐ ｎｏｖ．、短柄和平水母Ｅｉｒｅｎｅ ｂｒｅｖｉｓｔｙｌｕｓ．ｎｏｖ．、乳突多管水母Ａｅｑｕｏｒｅａ ｐａｐｉｌｌａｔａ ｓｐ．ｍｏｖ．。     

拟柄突和平水母在中国的首次发现及其生活史观察

报道青岛海洋科技馆培养的和平水母属(软水母亚纲,和平水母科)一种我国的新纪录--拟柄突和平水母西 Eirene lacteoides Kubota and Horita,1992.首次提供该种水母水螅体的形态,并对各期水母体的特征进行描述,为编写水螅水母动物志提供参考.     

Low-molecular-weight factors from colonial hydroids affect pattern formation

Summary Two morphogenetic factors have been isolated from tissue of colonial hydroids. Both exert strong effects on pattern formation during metamorphosis, regeneration and colony development. Polyp-inhibiting factor (PIF) is a bivalent inhibitor which strongly affects head and bud formation but acts weakly on stolon branching. Proportion-altering factor (PAF) is a distalizing factor. It counteracts the formation of stolon and promotes the formation of head structures during metamorphosis and regeneration. PIF and PAF antagonistically influence the spatial arrangement of polyps within a colony. They are capable of dislocating structures and thus appear to interfere with or are even part of the pattern-controlling mechanism. Both factors are of low molecular size (about 500 daltons), hydrophilic and probably not peptides.