More than 80 species have been collected and 18 of them including six new species and 12 new geographical records have been worked out in china . they are : comesoma , comesomatidae ; pomponema , cyatholaimidae ; marylynnia , cyatholaimidae ; pterygonema , ceramoneniatidae ; metachromadora , desmodoridae ; desmoscolex , desmoscolecidae aponema , microlaimidae ; gammarinema , monhysteridae ; metadesmolaimus , xyalidae ; rhynchonema , xyalidae ; xyala , xyalidae ; viscosia , oncholaimidae we found divergence in the species composition in different habiting area ( mud flat and sand flat ) . the investigation put emphasis on some area , try to know the distribution of marine nematodes for the later research of the position of marine nematodes in the benthic eecological system 这十一个属包括：联体线虫科( comesomatidae )的联体线虫属( comesoma ) ；杯咽线虫科( cyatholaimidae )的华丽线虫属( pomponema ) ；杯咽线虫科( cyatholaimidae )的玛里林恩线虫属( marylynnia ) ；覆瓦线虫科( ceramonematidae )的翼纹体线虫属( pterygonema ) ；链环线虫科( desmodoridae )的后菱光线虫属( metachromadora ) ；微咽线虫科( microlaimidae )的厚甲线虫( aponema ) ；单宫线虫科( monhysteridae )的嗜鲸线虫属( gammarinema ) ；希阿利线虫科( xyalidae )的后棘线虫属( metadesmolaimus ) ；希阿利线虫科( xyalidae )的吻腔线虫属( rhynchonema ) ；希阿利线虫科( xyalidae )的双翼线虫属( xyala ) ；瘤线虫科( oncholaimidae )的显齿线虫属( viscosia )此外我们报道了六个新种，并对一些已经报道过的虫种进行重新的描述和讨论。
