• The cushion–star Parvulastra exigua in South Africa : one species or more? 

      Payne, Robyn P.; Griffiths, Charles L.; Von der Heyden, Sophie; Koch, Erich (Pensoft, 2015-09)
      The cushion–star Parvulastra exigua (Lamarck, 1816) is a widely distributed member of the temperate intertidal fauna in the southern hemisphere. In South Africa, it occurs in sympatry with the endemic Parvulastra dyscrita ...