She was known for her work on the families Cichlidae and Sciaenidae .
Dr. Ethelwynn Trewavas ( 5 November 1900 -- 16 August 1993 ) was an ichthyologist at the British Museum ( Natural History ) .
Ethelwynn Trewavas was known for Ethelwynn Trewavas ' work on the families Cichlidae and Sciaenidae .
Dr. Ethelwynn Trewavas ( 5 November 1900 -- 16 August 1993 ) was an ichthyologist at the British Museum ( Natural History ) .