[1] From 1928 to 1929, he was an assistant of Richard Hesse, and from 1931 to 1943 he worked for the German Council of Scientific Research doing field studies in entomology and ecology.
[1] In 1938, he worked as an entomologist at the agricultural experimental station (Estación Agrícola de La Molina) in Lima, Peru.
At the time of World War II, he moved to Texas, where he did field work in entomology and malacology.
[citation needed] Weyrauch studied land and freshwater gastropods of South America, mainly taxa belonging to the families Camaenidae, Charopidae, Clausiliidae, Endodontidae, Helicinidae, “Hydrobiidae”, Orthalicidae, Pupillidae, Scolodontidae, Subulinidae, and Urocoptidae.
[citation needed] He left behind many type specimens in museums, of which he published no original description.