Geoffrey Fryer. 6 August 1927—18 March 2024

Geoffrey Fryer started his research career in 1953, surveying the biological resources of Lake Nyasa in Malawi. He was a genuine natural historian and published on an astonishing range of topics that can be loosely grouped into four categories: the fauna of the African Rift Valley lakes; the functional morphology of Crustacea; the biology and taxonomy of parasitic crustaceans on fish; and the natural history of Yorkshire. Geoffrey has a lasting scientific legacy in all these areas. His work on African lakes highlighted the spectacular diversity of the cichlid fishes, particularly their feeding mechanisms and reproductive behaviour. The same fascination with how animals work lay behind Geoffrey’s long series of landmark monographs exploring the functional morphology of crustaceans from water fleas to shrimps. He combined extensive observations of the behaviour of live animals with detailed examination of their skeletomusculature. Geoffrey’s work on parasitic crustaceans involved describing and naming 27 new species of parasitic crustaceans from African freshwater fish. For this work he was awarded the Elsdon–Dew medal by the Parasitological Society of South Africa in 1998. Geoffrey’s profound interest in the natural history of his native Yorkshire blossomed into a wonderful book The freshwater Crustacea of Yorkshire . He also felt strongly that mainstream research had neglected the detailed records of various species documented by local natural historians. Partly based on these records, he re-examined and absolutely rejected the textbook explanation of industrial melanism in the moths of the industrial north of England. The evidence he presented is well worthy of consideration.