Becker 1997. Contributions to Palaeozoic ostracod classification [POC], no. 1. "Non kirkbyacean" ostracods: families Ordovizonidae n. fam., Kirkbyellidae Sohn, Scrobiculidae Posner, and Cardiniferellidae Sohn. With description of the new family Ordovizonidae n. fam. and a new kirkbyellid genus: Eukempfella n. g. Sonderveroeffentlichungen des Geologischen Instituts der Universitaet zu Koeln, 114 1997: 29-57