A new species Cheatomorpha valida Kuetz(Cladophoraceae, Chlorophyta)as a main harmful alga was first found and described in sea cucumber ponds in coastal Dalian, Liaoning province, China.

• 摘要报道了大连各地海参养殖池中主要敌害藻类-强壮硬毛藻（绿藻门，刚毛藻科），该种为中国新记录种。