Career
In 1895 he succeeded Carl Eduard Adolph Gerstaecker as director of the zoological museum at Greifswald, a position he maintained until 1923. He was the taxonomic authority of numerous taxa in Ostracoda. A few examples being the subfamily Conchoeciinae and the genera Archiconchoecia, Cytherois and Stenocypria.
In 1965, the genus Muellerina Bassiouni (family Hemicytheridae) was named in his honor.