Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Sergius makes her his personal physician and eventually Nomenclator. The cipher used was a nomenclator cipher. A nomenclator of all Paludomidae was published in 2019. A nomenclator comprises a hybrid of code and cipher. In 2003, a checklist and nomenclator was published for Araliaceae. He also assisted Louis Agassiz with his "Nomenclator Zoologicus" (1842). One once-common variant of the substitution cipher is the nomenclator.