| Summary: | Hippodonta lange-bertalotii Van de Vijver, Mataloni & Vinocur sp. nov. is described from Crater Lake, Deception Island (South Shetland Islands). Present paper reports a detailed morphological description of this species by means of light and scanning electron microscopy. The main diagnostic criteria include the rhombic outline of the valves, the comparatively narrow striae and the presence of two shortened striae delimiting the central area. The adscription of this new species to the genus Hippodonta and the differences with related taxa are briefl y discussed. Additionally, the morphological variability of the similar H. pseudacceptata is examined analyzing the valvar ultrastructure of different populations collected from Western Europe or published in the literature. Hippodonta pumila is presented as a heterotypic synonym of H. pseudacceptata. Fil: Blanco, Saúl. Universidad de León; España. Public Research Centre – Gabriel Lippmann. Department of Environment and Agro-Biotechnologies; Luxemburgo Fil: Van de Vijver, Bart. National Botanic Garden; Bélgica Fil: Vinocur, Alicia Liliana. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina Fil: Mataloni, Maria Gabriela. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental. - Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigación e Ingeniería Ambiental; Argentina Fil: Gomá, Joan. Universidad de Barcelona; España Fil: Novais, María Helena. Universidade de Évora; Portugal Fil: Ector, Luc. Public Research Centre – Gabriel Lippmann. Department of Environment and Agro-Biotechnologies; Luxemburgo
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