Italian marine Gastrotricha: III. Four new pentancrous species of the genus etranchyroderma (Macrodasyida, Thaumastodermatidae)

Of the thaumastodermatid gastrotrichs that avere collected in the years 1989-1991, during a faunistic survey of the Italian coasts, several have been placed in the genus Tetrancbyroderma. On the basir of their distinctive morphological characters, four that bear pentancres are being described as new species, three with a complete dorsal covering of ancres: T kontosomum, T polyprobolostomum, T tanymesatberum, and one with an incomplete covering: T anomalopsum