Tetranchyroderma sardum, a new species of the family Thaumastodermatidae (Gastrotricha, Macrodasyida)

Tetranchyroderma sardumt, a new species of macrodasyid gastrotrich, was found in litoral sancl from Sardinia. lt is characterizecl bJ-: 1. two pairs of cephalic tentacles, one rod-like and the other knoblike; 2. twenty-two pairs of ventrolateral adhesive tubes; 3. thrce furcal adhesive tubes and 4. thirteen longituclinai rows of pen tancres. T. sardum closely resembles T. esarabdophorum and T. antennata, both collectecl from the Mediterranean Sea.