Octolasmis is a special Genus in Cirripede. Octolasmis spp. attached on the gills and appendages of crab. They have formed the special biological characteristics for adapting the sessile life during the long term evolutionary process, effecting the breath, development and ingestion of hosts. Goose barnacle, O. neptuni attached on the gills and appendages of the swimming crab, Portunus trituberculatus, one of the important crab in China, effecting the growth and development of the hosts. We stu...