The Discovery Expedition sea cucumbers (Echinodermata: Holothuroidea) Author O’Loughlin, P. Mark Marine Biology Section, Museum Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia pmoloughlin@edmundrice.org text Memoirs of Museum Victoria 2016 2016-12-31 75 53 70 journal article 10.24199/j.mmv.2016.75.03 1447-2554 urn:lsid:zoobank.org:pub:7039F593-8FE2-4668-BBC9-E18F2D82F8F8 3. Pentactella Verrill, 1876 . Many Discovery Expedition lots have been identified as species of Pentactella Verrill, 1876 . Based on morphological characters and distribution consideration, and with the support of some genetic data, O’Loughlin et al. (2014) reassigned numbers of species of Pseudocnus Panning, 1949 to a new genus Laevocnus O’Loughlin (in O’Loughlin et al. 2014 ). Immediately after publication the authors recognized that the type species for the new genus Laevocnus was the type species for the monotypic Pentactella Verrill, 1876 . Laevocnus is an objective junior synonym of Pentactella . A detailed systematic history of genus Pentactella , and the assigned species, is provided by O’Loughlin et al. (2015) .