Two new species of Thaumastoderma (Gastrotricha, Macrodasyida) from the west coast of Norway

摘要: Abstract Two new species of Thaumastoderma (Gastrotricha, Macrodasyida) are described from the Bergen area, western Norway. Th. truncatum sp. n. inhabits shell gravel exposed places; bifurcatum is mostly found in finer sediments less places, and reported also Trondheim Tromso areas. Both have one pair spatulate tentacles lack eyespots. can be distinguished other members genus by these characters: six pairs dorsal cirri, fourth being especially long; looped vas deferens. long posterior cirri a adhesive tubule directly below, with impression double ‘furca’. A key to included.