oxnerella oxnerella oxnerella is a genus of centrohelid. oxnerella scientific classification domain: eukaryota (unranked): hacrobia class: centrohelea order: pterocystida family: oxnerellidaecavalier-smith & chao 2012 genus: oxnerelladobell 1917 species: oxnerella maritima binomial name oxnerella maritimadobell 1917 it includes the species oxnerella maritima.