Ethelwynn Trewavas (5 November 1900 – 16 August 1993)[1] was an ichthyologist at the British Museum of Natural History.
She received her bachelor's degree and Board of Education Certificate in Teaching in 1921 from Reading University, and then worked as a teacher before being employed by the King's College of Household and Social Science as a part-time demonstrator, spending most of her time on research.
[5] Of the Haplochromis sensu lato in the lake, five were described by Regan and twenty-seven by Trewavas, either individually or in partnership with David Eccles.
When her eyesight failed she insisted that he accept her stereo microscope as a gift so he could continue her work with African cichlids.
Even during her lifetime, more fish species had received the specific epithet trewavasae ("of Trewavas") or ethelwynnae ("of Ethelwynn") than were named after most other modern fish researchers, underscoring the importance of her contribution to the field: After her death, the memory of her contributions remained.